Augustine of Hippo (354–430 AD) and Thomas Aquinas (1225–1274 AD) are the two greatest philosophical theologians of Western Christianity. Augustine shaped Christian thought for nearly a millennium before Aquinas; Aquinas restructured it. Augustine brought Platonism into Christianity; Aquinas replaced it with Aristotle. Their disagreement about the relationship between reason and faith defines Western theology.
| Category | Augustine of Hippo | Thomas Aquinas |
|---|---|---|
| Born / Died | 354–430 AD, North Africa | 1225–1274 AD, Italy |
| Philosophical source | Neoplatonism — physical world as shadow of ideal Forms; God as the supreme Form (Good) | Aristotelianism — physical world is real; God as unmoved mover; natural law derived from reason |
| Original sin | Central: humanity's nature is deeply corrupted; grace is irresistible and not earned | Present but nature not wholly corrupted; grace and reason can cooperate |
| Reasonvs. faith | 'I believe in order to understand' — faith precedes and enables reason | 'I understand in order to believe more fully' — reason and faith are compatible and complementary |
| On free will | Predestination; God's grace precedes and determines will; influenced Calvin and Luther | Free will is genuine; humans can choose good; grace perfects rather than replaces nature |
| Political theology | Two Cities — City of God vs City of Man; church and state in tension | Just war theory; natural law as basis for political ethics |
| Legacy | Protestant Reformation (Luther's Augustinianism); confessions genre; philosophy of history | Catholic scholasticism; natural law political theory; Thomism still official Catholic philosophy |
Augustine is the more psychologically profound; Aquinas the more philosophically systematic. Augustine's influence on Protestantism is greater; Aquinas's influence on Catholicism is deeper and more durable.
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