What the Early Church Believed—and What Came Later

Denzinger part 42

Philosophy, Theology, and the Limits of Human Systems

In 1857, under Pope Pius IX, the Holy See condemned aspects of the thought of Anton Günther. Among the concerns expressed was the tendency to elevate philosophy above divine revelation. The document states:

"Philosophy and human studies are not always consistent, and are not immune to a multiple variety of errors."

On one level, this statement is difficult to dispute. Human reason is finite. Philosophical systems rise and fall. The history of thought is filled with theories once regarded as certain that were later abandoned. Aristotle was not infallible. Plato was not infallible. Neither were the Stoics, the Neoplatonists, nor any other philosophical school. If philosophy is a human enterprise, it necessarily remains capable of error.

Yet this admission raises an important question. If philosophy and human studies are indeed subject to "a multiple variety of errors," why have so many theological doctrines come to be explained through philosophical systems that are themselves acknowledged to be fallible?

The question is particularly relevant when one considers the immense influence of Aristotelian philosophy upon medieval theology. Concepts such as substance and accidents, matter and form, act and potency, and essence and existence became deeply woven into theological discussion. The standard scholastic explanation of transubstantiation relies heavily upon distinctions drawn from Aristotelian metaphysics.

A doctrine does not become false merely because philosophical language is used to explain it. Nevertheless, the question remains whether Scripture itself teaches the doctrine, or whether later philosophical categories became so influential that they shaped the way Scripture was interpreted.

The issue is not whether philosophy may assist theology. Christians throughout history have used philosophical language in an attempt to clarify theological truth. The issue is whether philosophical systems remain servants of Scripture or whether they begin to function as controlling frameworks through which Scripture must be read.

The concern becomes even more significant when one remembers that many philosophical assumptions once regarded as authoritative have later been questioned, revised, or abandoned. If philosophy is indeed "not immune to a multiple variety of errors," then every doctrine heavily dependent upon a particular philosophical framework deserves careful examination. The ultimate question is not whether a doctrine can be expressed philosophically, but whether it can be established from the teaching of Scripture itself.

For those committed to the principle that divine revelation must stand above human speculation, the challenge is therefore clear: theological doctrines should not be believed merely because they fit a philosophical system. They must ultimately be tested by the witness of Scripture, which alone possesses divine authority.

Philosophy as Servant or Master?

In 1862, Pope Pius IX issued a condemnation of certain teachings associated with the German philosopher James Frohschammer. Although the controversy itself may appear remote from the concerns of modern readers, it raises a question that strikes at the very heart of theological development: What role should philosophy play in the formulation of Christian doctrine? More specifically, when does philosophy serve divine revelation, and when does it begin to shape, control, or even replace it?

The concern expressed by Pius IX was that human reason was being granted an authority that properly belonged to divine revelation. In opposing Frohschammer's views, the Pope insisted that philosophy has legitimate value, yet remains subject to limitations. He stated:

"Philosophy and human studies are not always consistent, and are not immune to a multiple variety of errors."

This admission is significant. It acknowledges that philosophy is neither infallible nor self-correcting in every instance. Human thought changes from age to age. Entire systems once regarded as certain have later been abandoned. Philosophers frequently contradict one another, and even the greatest minds in history have often erred. Aristotle differed from Plato. The Stoics differed from the Epicureans. Descartes differed from Locke. Kant differed from both. The history of philosophy demonstrates not a steady march toward certainty but an ongoing debate concerning reality, truth, knowledge, morality, and existence itself.

Yet Pius IX also affirmed:

"True and sound philosophy has its own most noble position."

This statement reflects a long tradition within Christianity. The Church has never generally condemned reason itself. Christian theologians have often employed philosophical language to defend the faith, explain doctrine, and answer objections. The issue is therefore not whether philosophy may be used. The issue is whether philosophy remains a servant of revelation or becomes its master.

The Scriptures repeatedly warn believers against elevating human wisdom above divine truth. The Apostle Paul writes:

"Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ" (Colossians 2:8).

Paul's warning is frequently misunderstood. He is not condemning rational inquiry itself, for he regularly reasons, argues, and debates throughout his ministry. Rather, he warns against philosophical systems that substitute human speculation for divine revelation. The danger lies not in thinking, but in thinking independently of God.

The same concern appears elsewhere in Paul's writings:

"The world by wisdom knew not God" (1 Corinthians 1:21).

And again:

"My speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power" (1 Corinthians 2:4).

Later in the same chapter he explains:

"Not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth" (1 Corinthians 2:13).

Likewise, Paul exhorts Timothy:

"O Timothy, keep that which is committed to thy trust, avoiding profane and vain babblings, and oppositions of science falsely so called" (1 Timothy 6:20).

Throughout the New Testament, revelation occupies the highest place. Human reason has value, but it is not supreme. Human wisdom may assist faith, but it may not judge faith. Truth descends from God; it does not ascend from philosophical speculation.

The difficulty, however, is that the history of theology often appears far more complicated than this principle would suggest.

If philosophy is capable of error, and if revelation must remain supreme, then one might reasonably ask why later Christian theology became so dependent upon particular philosophical systems. No philosopher exerted greater influence upon medieval theology than Aristotle. His categories became woven into the fabric of Western theological thought to such an extent that many doctrines eventually came to be explained through concepts borrowed directly from his metaphysics.

Among these categories were substance and accidents, matter and form, act and potency, essence and existence, and final causality. These concepts were not merely discussed in academic settings. They became foundational tools through which theologians explained doctrines concerning God, creation, the sacraments, human nature, grace, and salvation.

The doctrine of transubstantiation provides perhaps the clearest example.

The words of Christ recorded in Scripture are straightforward:

"This is my body."

Yet the explanation eventually given by medieval theology relies heavily upon Aristotelian distinctions between substance and accidents. According to this explanation, the substance of bread becomes the substance of Christ's body while the accidents remain unchanged. Appearance, taste, texture, smell, and weight continue as before, but the underlying substance is transformed.

Whatever one believes concerning the Eucharist, an important question must be asked. Where does Scripture teach the distinction between substance and accidents? Where do the apostles explain Christ's words using Aristotelian metaphysics? Where are believers instructed to understand the Lord's Supper through categories developed centuries after the New Testament was written?

The issue is not whether philosophical language can be useful. The issue is whether doctrines eventually become inseparable from philosophical frameworks that Scripture itself never employs.

This question becomes even more interesting when one considers the history of the Index of Forbidden Books.

The Roman Church repeatedly praised philosophy as a noble discipline while simultaneously placing numerous philosophical, theological, and scientific works under prohibition. The Index eventually included works by figures such as Descartes, Locke, Montesquieu, Rousseau, Voltaire, and Kant. Various writings associated with modern philosophy, biblical criticism, and scientific inquiry were judged dangerous to faith or morals.

This raises a significant tension. On the one hand, philosophy is praised as a valuable servant of truth. On the other hand, philosophical investigation is often restricted when it challenges established theological conclusions.

The purpose of the Index was undoubtedly the protection of faith as understood by Church authorities. Nevertheless, the existence of the Index inevitably raises questions concerning the freedom of inquiry. If philosophy is useful, to what extent may it follow evidence wherever that evidence leads? If reason is capable of examining truth, what happens when philosophical investigation arrives at conclusions that conflict with existing doctrine?

The controversy surrounding Galileo illustrates a similar problem. The issue was not merely astronomy. It concerned authority, interpretation, and the relationship between observation and tradition. Galileo's conflict demonstrated how easily institutions can mistake their own interpretations for divine revelation itself. History later forced a reconsideration of conclusions that once seemed certain.

The broader issue therefore extends far beyond Aristotle, Frohschammer, or Galileo.

At stake is the question of authority.

What ultimately determines Christian doctrine? Is it Scripture? Is it philosophy? Is it ecclesiastical tradition? Is it theological consensus? Is it scientific investigation?Observing the heavens?

The Roman Church insists that philosophy must submit to revelation. Yet many of the doctrinal explanations developed within that same tradition rely heavily upon philosophical categories inherited from thinkers who possessed no prophetic or apostolic authority.

This does not automatically render those doctrines false. Philosophical language may indeed help clarify theological truth. Nevertheless, if philosophy is truly "not immune to a multiple variety of errors," then doctrines that depend heavily upon philosophical systems deserve careful examination. The mere fact that a doctrine fits neatly within a philosophical framework cannot establish its truth.

Should Christians be required to believe a doctrine because it is clearly taught in Scripture, or because it is supported by a sophisticated philosophical explanation developed centuries later?

The apostles consistently directed believers back to the Word of God. Human wisdom changes. Philosophical systems evolve. Scientific theories are revised. Ecclesiastical institutions rise and fall. Yet the Scriptures remain the enduring standard by which all claims must be tested.

For this reason, philosophy is most beneficial when it serves revelation and most dangerous when it seeks to govern it. The question is not whether philosophy has value. The question is whether it remains a servant of truth or becomes an authority alongside it. Once philosophical systems begin functioning as foundations for dogma rather than tools for understanding it, Christians are justified in asking whether the doctrine rests upon the voice of God or upon the reasoning of men.

Pius IX was correct to warn that philosophy is capable of error. The challenge is to apply that principle consistently. If philosophy can err, then every doctrine whose explanation depends heavily upon philosophical assumptions should remain subject to examination in the light of Scripture. The final authority for the Christian cannot be Aristotle, Plato, Aquinas, Kant, a council, or a pope. The final authority must be the revelation of God.

Development, Contradiction, or Reinterpretation?

One of the most difficult questions facing any institution that claims divine authority is the question of consistency. If a church claims not merely to teach truth but to possess a unique authority to define truth for all believers, then its teachings must be examined not only for sincerity or good intentions but for continuity. The question is not whether cultures change, political circumstances change, or historical conditions change. The question is whether doctrine itself remains the same.

This issue becomes particularly significant when one traces Roman Catholic teaching from the medieval period through the nineteenth century and into the modern era. Throughout Denzinger one repeatedly encounters language of certainty, exclusivity, and finality. Yet when those earlier statements are compared with later expressions of ecumenism, interfaith dialogue, and religious pluralism, a serious question emerges. Has the doctrine remained unchanged while only its presentation has developed, or have substantial shifts occurred beneath the language of continuity?

The question is not merely theoretical. It is rooted in specific historical statements.

In 1459 Pope Pius II condemned the proposition:

"That Jesus Christ, Moses, and Mohammed ruled the world by the pleasure of their wills."

The significance of this condemnation should not be overlooked. The proposition effectively reduced Christ to the level of a merely human religious founder. Moses, Christ, and Muhammad were treated as comparable figures who established religious systems and exercised influence through leadership and teaching. The condemnation rejected such leveling outright. Christ was not to be understood as merely one religious teacher among others, nor as one founder among several competing paths to God. The uniqueness of Christ, the uniqueness of His revelation, and the uniqueness of the Christian faith were regarded as truths that could not be diluted without damaging the foundations of Christianity itself.

Yet when one surveys much contemporary religious dialogue, a striking contrast appears. Modern discussions frequently emphasize common ground among Christianity, Judaism, and Islam. Conferences, interfaith gatherings, and public statements often present Jesus, Moses, and Muhammad together as central figures in humanity's religious history. The emphasis commonly falls upon shared values, shared ancestry, common ethical concerns, and common aspirations for peace.

"For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape."

— 1 Thessalonians 5:3 (KJV)

The issue is not whether Christians should treat people of other faiths with dignity and respect. Scripture clearly commands such behavior. The issue is whether the framework itself has shifted. What earlier generations condemned as a dangerous leveling of Christ with other religious founders often appears today as an accepted feature of interreligious discourse.

The same tension appears in the nineteenth century.

In 1863 Pope Pius IX addressed what he regarded as the grave error of religious indifferentism. He wrote:

"The Catholic dogma that no one can be saved outside the Catholic Church is well-known."

This statement presents itself not as a theological opinion but as settled dogma. Pius IX further declared that those:

"who persistently separate themselves from the unity of the Church, and from the Roman Pontiff... cannot obtain eternal salvation."

The language is clear and uncompromising. Salvation is inseparably connected with communion with the Roman Church and submission to the Roman Pontiff. The Roman Church is not merely presented as the best expression of Christianity, nor even as the fullest expression of Christianity. Rather, it is presented as the unique ark of salvation outside of which eternal salvation cannot ordinarily be found.

To be sure, Pius IX immediately introduces an important qualification:

"They who labor in invincible ignorance of our most holy religion... can, by the operating power of divine light and grace, attain eternal life."

Even with this qualification, however, the fundamental framework remains unchanged. The Roman Church is still presented as the divinely established means of salvation. Exceptions may exist because of God's mercy and because of circumstances beyond a person's control, but the exclusivity of the claim remains intact.

When one moves into the twentieth century, however, the tone becomes noticeably different.

The Second Vatican Council declared:

"The Catholic Church rejects nothing that is true and holy in these religions."

The Council further stated that non-Christian religions often:

"reflect a ray of that Truth which enlightens all men."

Likewise, Lumen Gentium states:

"The plan of salvation also includes those who acknowledge the Creator, in the first place amongst whom are the Muslims."

The document continues by affirming that Muslims:

"together with us adore the one, merciful God."

Such language would have sounded remarkably foreign to many earlier generations of Catholic theologians. The language of separation appears increasingly replaced by the language of commonality. The language of exclusivity increasingly gives way to the language of dialogue. Earlier generations frequently emphasized what separated Christianity from other religions. Modern statements often emphasize what is shared.

This development continued under John Paul II.

In Ut Unum Sint, speaking of communities separated from Rome, he wrote that they:

"have by no means been deprived of significance and value in the mystery of salvation."

He further stated that the Spirit of Christ uses them as:

"means of salvation."

Perhaps even more striking was the emergence of large-scale interfaith initiatives. Gatherings such as the Assisi meetings brought representatives of numerous religions together for prayer and dialogue. Whatever the intentions behind such events, they represented a form of engagement that would have appeared extraordinarily difficult to reconcile with many earlier condemnations of indifferentism and religious error.

The trend reached another milestone in the 2019 Document on Human Fraternity, which states:

"The pluralism and the diversity of religions... are willed by God in His wisdom."

Regardless of how one interprets the statement, it is difficult to reconcile its language with the tone of earlier condemnations without substantial explanation. Earlier generations emphasized the uniqueness of the true religion and the dangers of religious error. Modern statements frequently emphasize coexistence, dialogue, mutual respect, and common human fraternity.

What makes this progression particularly noteworthy is not merely the existence of individual statements, but the cumulative direction in which the statements appear to move. When viewed together, they seem to trace a path from exclusivity toward inclusivity, from separation toward dialogue, and from emphasis upon the uniqueness of the Roman Church toward increasing recognition of spiritual value outside her visible boundaries.

The issue is not whether Christians should show charity, kindness, respect, and compassion toward those of other faiths. Scripture itself commands believers to love their neighbors and even their enemies. The issue is whether the theological framework has remained substantially unchanged.

Defenders of Roman Catholicism argue that no contradiction exists. They maintain that doctrine remains unchanged while the Church's understanding and expression of that doctrine have matured. According to this view, modern ecumenical and interfaith efforts represent pastoral developments rather than doctrinal revisions.

Critics raise a different concern.

They observe a recurring pattern throughout the history of doctrinal development. Statements once presented with certainty are later surrounded by qualifications. Earlier formulations are reinterpreted through later documents. Positions that once appeared rigid gradually become flexible. Language that once emphasized separation is replaced by language emphasizing inclusion. Boundaries that once appeared sharply defined become increasingly nuanced.

For many critics, the difficulty lies not merely in any single statement but in the appearance of an institution that seems capable of presenting itself differently in different ages while maintaining that its doctrine remains fundamentally unchanged. Medieval Christendom emphasized exclusivity. The modern world prizes inclusion, tolerance, dialogue, and cooperation. Critics argue that the Church often appears to mirror these broader cultural transitions while simultaneously insisting that no substantive change has occurred.

This concern becomes especially significant because of the structure of authority itself. The Roman Catholic Church claims not merely to preserve doctrine but to define it. When tensions arise between earlier and later statements, the Church itself becomes the final interpreter of both. Earlier teachings are explained by later teachings, and later teachings are justified by the authority that produced the earlier ones.

Critics have often argued that this creates a circular system. The Church claims authority to define doctrine. The proof of that authority is the Church's own teaching authority. When apparent contradictions arise, the same authority determines how the contradictions are to be understood. Every development is declared harmonious because the institution that introduced the development also possesses the authority to define harmony.

Whether one accepts that criticism or not, the historical question remains unavoidable.

Jude exhorts believers to:

"earnestly contend for the faith which was once delivered unto the saints" (Jude 3).

The apostolic faith is presented as a deposit received, preserved, and transmitted. The emphasis falls upon fidelity to what was delivered rather than the continual expansion of doctrine. The New Testament repeatedly points believers back to the apostolic message rather than forward to future doctrinal definitions.

The central question therefore remains the same. Are these developments examples of a deeper unfolding of apostolic truth, or do they reflect an institution adapting its language and theology to changing cultural expectations?

When viewed across centuries, the cumulative pattern raises difficult questions. The movement from medieval condemnations, to nineteenth-century exclusivism, to modern ecumenism and interfaith dialogue has led many observers to conclude that the Church often appears capable of presenting itself differently in different eras while maintaining that its underlying doctrine remains unchanged. Supporters describe this as legitimate development. Critics describe it as adaptation.

The debate ultimately concerns more than interfaith dialogue. It concerns the nature of authority itself. Is the Church primarily a guardian of a completed apostolic deposit, or does it possess authority to define, expand, and reinterpret doctrine as history unfolds?

The answer to that question determines how one interprets not only these developments, but the entire history of Roman Catholic doctrine.