Plato, Aristotle, and Aquinas: Philosophical Differences

Platonic vs. Aristotelian Epistemology

According to Thomas Aquinas, the human mind derives concepts from the abstraction of sensory data. Unlike Plato, who claimed that humans possess innate ideas known by the soul before birth, Aquinas follows Aristotle in distinguishing between two types of knowledge: sensitive and intellectual.

The Process of Knowledge

• Plato: Ideas are separate realities acquired through intuition, often occurring suddenly.
• Aristotle and Aquinas: Knowledge occurs gradually through abstraction.

For Aquinas and Aristotle, ideas exist within objects, whereas for Plato, ideas are separate entities. Furthermore, while Aquinas and Aristotle trust the senses, Plato argues that the senses can deceive us. Aquinas also posits that creatures are composed of essence and being, drawing on the Christian concept of participation. Ultimately, the foundation of Aquinas's thought is deeply rooted in Platonic and Neoplatonic inspiration.

The Aristotelian Influence on Aquinas

Aquinas adopts the Aristotelian conception of hylemorphism, viewing the soul as the form of the body. He affirms that man is a single substance composed of soul and body. While Aristotle denied the immortality of the soul, Aquinas departs from this view, attempting a synthesis between Platonism and Aristotelianism.

Compatibility with Christian Faith

Aquinas was convinced that Aristotelian philosophy was entirely compatible with the Christian faith. He utilized Aristotle's framework while maintaining fundamental Platonic principles. Key Aristotelian concepts adopted by Aquinas include:

• Theory of substance and accidents
• Theory of matter and form
• Theory of potentiality and act (movement)
• Theory of the four causes
• Theory of analogy