Brings together sermons, commentary responses to criticism, and substantial extracts from the "Summa Theologiae," arranged chronologically.

The inaugural sermons (1256) -- On the principles of nature (1252-6) -- On being and essence (1252-6) -- The nature of theology. Commentary on Sentences 1, prologue (1252-4) -- The word of the six days of creation. Commentary on Sentences 2.2, d. 12 (1252-4) -- Theology, faith and reason. On Boethius On the Trinity, 1-2 (1257) -- How are things good? Exposition of On the Hebdomads of Boethius (1257) -- The meanings of truth. Disputed question on truth, I (1256-9) -- On the teacher. Disputed question on truth, II (1256-9) -- On conscience. Disputed question on truth, 17 (1256-9) -- Proof of God's existence. Summa contra Gentiles, 1, 9-14 (1259) -- The human good. Summa contra Gentiles, 3 (1259-65) -- On the divine simplicity. Disputed question of the power of God, 7 (1265-6) -- On goodness and the goodness of God. Summa theologiae, 1, 5-6 (1268) -- On creation. Summa theologiae, 1 44 (1268) -- On angelic knowledge. Summa theologiae, 1, 54-8 (1268) -- Definitions of soul. On Aristotle's De anima, 2, 1-3 (1268) -- Platonism and Neoplatonism. Preface to exposition of On the divine names (1265-8) -- The range of natural philosophy. Expositions of Physics, 1, 1, preface to On the heavens, preface to On sense and the sensed object (1269) -- How words mean. Exposition of On interpretation, 1-5 (1270-71) -- On the ultimate end. Summa theologiae, 1-2, 1-5 (1271) -- On human choice. Disputed question on evil, 6 (1266-72) -- What makes actions good or bad? Summa theologiae, 1-2, 18-20 (1271) -- On law and natural law. Summa theologiae, 1-2, 90-94 -- The virtues. Summa theologiae, 1-2, 55-7 (1271-2) -- The active and contemplative lives. Summa theologiae, 2-2, 179-81 (1271-2) -- On the eternity of the world (1271) -- The love of wisdom, exposition of Metaphysics, preface and I, 1-3 (1271) -- The logic of the incarnation. Summa theologiae, 3, 16 (1273) -- What is a sacrament? Summa theologiae, 3, 6 (1273) -- The exposition of the Book of causes, 1-5 (1272) -- Exposition of Paul's Epistle to Philemon (1273) -- Exposition of the angelic salutation (Ave Maria) (1273).