The recovery of Aristotle's full corpus posed a profound challenge — his natural philosophy seemed to contradict creation ex nihilo, the immortal soul, and divine providence. Peter Lombard's Sentences (1150 AD) provided the systematizing framework that made Aristotelian logic available to theology, laying the groundwork for later scholastic engagement. Aquinas attempted the boldest synthesis, arguing that philosophy and revelation are complementary and that the wise person ascends from created things to God by degrees. Duns Scotus pushed back: while Aristotle's metaphysics illuminates the highest natural causes, God is not its proper subject — theology begins where Aristotle ends, with truths knowable only through revelation. Bonaventure meanwhile insisted that the soul's ascent to God depends on love and illumination, not rational demonstration alone.
The great apologia for Christian theology using Aristotelian natural reason as far as it goes, then transitioning to revelation for truths reason cannot reach — Aquinas's attempt to show that Christian faith and Aristotelian philosophy are not rivals but complementary.
"God is not the subject of metaphysics" — Scotus, engaging Avicenna and Averroes directly, argues that Aristotelian metaphysics reaches only as far as the highest natural causes; God as revealed falls outside its scope, so theology cannot be reduced to Aristotelian science. This critical engagement defined the limits of the Thomistic synthesis.
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