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Historical Setting and Early Influences

Thomas Aquinas was born in 1225 C.E. in Roccasecca near Aquino, in what is now Italy. While young, he was placed in a Benedictine monastery, though this early path shifted when he decided to join the Dominicans. He studied at the University of Naples and later under Albert the Great, who guided him in embracing Aristotle’s writings. Aquinas became adept at fusing classical philosophy with the doctrines upheld in his day, yet his approach contained terminology and viewpoints reflecting the medieval context.

Aquinas strove to incorporate the logical rigor found in Aristotle’s writings into the framework of Christian theology. Aristotle, who lived during the fourth century B.C.E., had offered a systematic approach to explaining the nature of reality, knowledge, and ethics. Many medieval thinkers hesitated to merge Greek philosophy with Christian belief because some saw in Aristotle’s ideas a risk of overshadowing the primacy of Scripture. Aquinas, however, believed that all truth belongs to God and that careful reasoning can serve biblical interpretation when handled responsibly. He maintained that Scripture remains the highest authority, yet rational inquiry can help clarify theological principles. Acts 17:2, 3 illustrates that the apostle Paul “reasoned” from the Scriptures, indicating that logical explanation need not contradict divine revelation.

Faith and Reason in Aquinas’s Thought

Aquinas addressed the interplay of faith and reason by teaching that faith rests upon God’s revelation as found in the Scriptures. Reason can confirm certain truths—such as the existence of God—but it cannot fully unveil every divine mystery. He identified several doctrines, like the Trinity, that surpass human logic, which must therefore be accepted by faith. At the same time, Aquinas urged believers to employ their minds. He viewed sound reasoning as a supportive tool for faith rather than an adversary.

He argued that human sin hampers the full exercise of reason. Consequently, not everyone would arrive at firm knowledge of God’s existence through logic alone, though in principle God’s existence could be demonstrated. Aquinas referenced passages like Psalm 19:1 to point to how the natural world testifies to a Creator. He also acknowledged that Romans 1:19-20 shows how God’s attributes can be perceived in the visible creation. While he believed Christians should not demand proof as the foundation of faith, he proposed that reason and evidence reinforce confidence in what Scripture proclaims.

Drawing on Aristotle’s Methods

Aquinas built much of his system on Aristotle’s concepts, carefully reexamining them from the standpoint of Christian conviction. Aristotle had written extensively on metaphysics, ethics, logic, and natural science. Aquinas believed these philosophical categories could be harmonized with biblical teachings. He hoped to show that faith did not oppose rational inquiry, that the truths of Scripture blend with real insight into the created world.

He explored knowledge by explaining that humans learn first through the senses, then progress to general concepts. This approach avoids any purely mystical notion of knowledge. He asserted that certain foundational principles, such as the principle of noncontradiction—“being is not nonbeing”—are self-evident once properly understood. His approach to epistemology attempted to protect Christians from vague speculation or purely subjective notions of truth. Colossians 2:8 warns believers not to be taken captive by empty philosophies, so Aquinas strove to ensure any philosophical method would not void the anchor of biblical truth.

Reconciling Essence and Existence

Aquinas refined Aristotle’s teachings to articulate a clear distinction between “essence” (what a thing is) and “existence” (that it is). He claimed that in created beings, essence and existence unite but remain distinguishable. Only God, in Aquinas’s view, stands as a pure act of being—never limited by potentiality. Exodus 3:14 highlights God’s self-description: “I am who I am,” suggesting that God depends on nothing else for existence. For Aquinas, this statement aligned with his assertion that God’s essence is to be.

In a created entity, essence does not automatically imply that the entity exists. By contrast, God’s essence and existence are identical. This concept was linked to Aquinas’s view that God is a necessary being, unchanging and eternal. James 1:17 underscores that in God “there is no variation or shifting shadow.” Aquinas interpreted such passages to confirm that God’s nature remains absolutely stable and self-sustaining.

Explaining the “Five Ways” for God’s Existence

Aquinas’s reliance on Aristotle’s ideas led him to formulate what became known as five ways to show God’s existence. He reasoned from observable phenomena (motion, causation, contingency, degrees of perfection, and design) back to the necessity of a first unmoved mover or ultimate cause. He believed Romans 1:20 harmonized with this effort, teaching that “his invisible qualities have been clearly seen” through what has been made. The steps in Aquinas’s arguments aimed to establish that finite, changing realities must originate from a being that is infinite and unchanging. Rather than replace faith, these arguments strove to show that belief in a Creator can be rationally warranted.

Understanding God by Analogy

Aquinas held that language applied to God must be analogical, since univocal language—that is, claiming the exact same meaning in reference to God and humans—cannot apply to an infinite Creator. He also rejected purely equivocal language that implies there is no real resemblance between God and creation. Instead, he proposed an approach that acknowledges a likeness between creaturely attributes and the divine archetype, though with infinite difference in degree. For instance, Jesus taught that earthly fathers give good gifts to their children, and then illustrated how God far surpasses that generosity (Matthew 7:11). In Aquinas’s view, we understand God’s goodness or wisdom by analogy with human goodness or wisdom, but we remove the finite limits.

This analogical method sought to heed biblical texts that depict God in ways accessible to human minds while maintaining reverence for His transcendence. Isaiah 55:9 reminds believers that God’s ways are higher than ours, but it does not suggest that we can learn nothing about Him. The infinite difference remains, yet the reflection in creation provides valid, though partial, knowledge.

Creation as Dependent on God

Aquinas maintained that the world was made out of nothing, in harmony with Genesis 1:1, “In the beginning God created the heavens and the earth.” Although he granted that logic alone would not disprove the possibility of an eternal creation, he accepted that Scripture teaches a temporal beginning. He explained that time itself began with creation, so there was no time “before” God created. This perspective reinforced the idea that God’s existence transcends created reality, since He alone is uncaused. Aquinas insisted that all creation depends moment by moment upon the sustaining power of God. Job 34:14-15 notes that if God withdrew His spirit, all flesh would perish. Aquinas found such scriptural statements to coincide with his philosophical view of an ever-dependent creation.

The Human Person and Moral Action

Aquinas took Aristotle’s emphasis on soul and body as a unified whole. He interpreted humans as composites of matter and a rational soul. He believed each soul is individually created by God, in line with the biblical notion that humans are formed by God’s direct action. Genesis 2:7 states that God “formed the man of dust from the ground and breathed into his nostrils the breath of life.” Aquinas regarded this as validating the uniqueness of human identity and pointed out that the soul could survive death, later to be reunited with a resurrected body.

He also outlined how ethics emerges from the rational nature God granted humanity. Humans discern moral principles through natural law, which resonates with Romans 2:14-15, indicating that people have an internal sense of right and wrong. This internal sense, though corrupted by sin, still testifies to God’s standards. Aquinas contended that Scripture clarifies and perfects any natural moral understanding, leading believers into deeper alignment with divine commands. His approach to virtue recognized both the need for prudence, courage, self-control, and justice, along with faith, hope, and love.

The Role of Scripture and Church Tradition

Although Aquinas lived within a religious structure that gave considerable weight to church tradition, he also repeatedly affirmed that Scripture is the highest authority in matters of truth. He understood that no philosophical argument can override the clear teachings of God’s revealed Word. He encouraged the serious study of both Scripture and theology, believing that God’s revelation surpasses human intellect.

He wrote his Summa Theologica primarily to systematize Christian teachings in a way that integrated philosophical rigor, but his references to biblical passages are extensive. He quoted and expounded on books from Genesis to Revelation, convinced that final authority rests with what God disclosed through inspired Scripture. He made frequent note of passages like 2 Timothy 3:16, “All Scripture is inspired by God,” as confirmation that the Bible stands supreme in revealing divine truths. Aquinas saw philosophical tools as subservient to Scripture, an attitude he felt was consistent with passages such as 1 Thessalonians 5:21, which admonishes Christians to “test all things,” ensuring that human reasoning never displaces revelation.

Neo-Thomism and Modern Evaluations

After Aquinas’s passing in 1274 C.E., many in the Roman Catholic tradition drew heavily from his works, sometimes elevating his writings to authoritative status. In later centuries, certain thinkers adapted Aquinas to fit new philosophical trends, while others endeavored to retain a more original Aristotelian structure. Thomas’s influence also reached beyond Catholic circles, as some conservative Protestant scholars recognized merits in his apologetic arguments for God’s existence and in his emphasis on objective moral values.

Contemporary readers may examine Aquinas’s writings with discernment, aware that he worked within a medieval context that used terms and frameworks somewhat foreign to modern readers. Yet many find value in his reasoned approach to faith. His method underscores how a believer can engage with philosophy while upholding Scripture’s divine authority. Colossians 2:2-3 affirms that true wisdom and knowledge are found in Christ, so any philosophical inquiry must remain subject to God’s revelation in Christ and in the inspired Scriptures.

A Measured Assessment from a Conservative Evangelical Viewpoint

From a conservative evangelical standpoint, Aquinas’s lasting appeal lies in his rigorous attempt to show that a coherent structure of belief emerges when one engages honestly with both the biblical message and natural observation. His use of Aristotle’s metaphysics, epistemology, and ethics formed a system that tried to uphold biblical truths about creation, God’s sovereignty, and human responsibility. That said, evangelicals typically insist that every philosophical framework be tested by Scripture, conscious of warnings found in passages such as 1 Corinthians 2:14 regarding the limitations of the “natural man” to grasp spiritual truths without the illuminating power of God’s Word.

Some evangelicals appreciate Aquinas’s demonstration that faith and reason are not necessarily at war. They might, however, question or refine elements of Thomistic thought if those elements appear to downplay doctrines such as humankind’s radical fallenness or the centrality of grace. Ephesians 2:8, 9 reminds readers that salvation is by grace through faith, underscoring that no intellectual pursuit can save. However, thoughtful reasoning can guide sincere inquirers, fortify believers, and facilitate dialogues with skeptics. Aquinas’s labors to reconcile biblical teachings with Aristotle’s categories remain an important chapter in the history of Christian thought, showing how reason can serve faith when governed by loyalty to God’s Word.

Concluding Thoughts

Thomas Aquinas lived during a period when classical philosophy and Christian doctrine converged in new ways. He championed a view that Scripture, illuminated by faith, holds ultimate authority, yet reason can serve as an instrument for exploring God’s universe. He employed Aristotle’s philosophical outlook—focused on causality, substance, form, and final ends—to provide structure for explaining theological principles such as God’s nature, creation, and morality. In presenting his perspective, he leaned on passages like Psalm 19:1 and Romans 1:19-20, which remind believers that creation points to the Creator. Through analogical language, he endeavored to speak about God in meaningful terms, acknowledging that finite expressions cannot capture the fullness of an infinite Being.

Although born in the thirteenth century, his influence continues to spark discussion about the relationship between faith and philosophy. Conservative evangelicals, while often differing from aspects of Aquinas’s church context, can glean insights from his conviction that faithful devotion to God does not negate disciplined thinking. Aquinas modeled a stance where the Christian can embrace wisdom from various sources, provided Scripture governs final conclusions. His voluminous writings uphold the principle that “all truth is God’s truth,” an idea consistent with John 17:17, which declares: “Your word is truth.”

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About the Author

EDWARD D. ANDREWS (AS in Criminal Justice, BS in Religion, MA in Biblical Studies, and MDiv in Theology) is CEO and President of Christian Publishing House. He has authored over 220+ books. In addition, Andrews is the Chief Translator of the Updated American Standard Version (UASV).