| Introduction | |
| Note on Sources and Text | |
| Select Bibliography | |
| Selected Philosophical Writings | |
| I | Structures of Thought | 1 |
| 1 | On Natural Science, Mathematics, and Metaphysics [Expositio super Librum Boethii de Trinitate, 2 [questions 5-6]] | 1 |
| II | Structures of Things in General | 51 |
| 2 | Being, Unity, Goodness, Truth [Quaestiones Disputatae de Veritate, 1.1-3, 21.1] | 51 |
| 3 | Actual and Potential Being [Quaestiones Disputatae de Potentia, 1.1] | 65 |
| 4 | Matter, Form, Agent, and Goal [De Principiis Naturae, complete] | 67 |
| 5 | Substance and Accidents, Action and Passion [In Aristotelis Libros Physicorum, 3.5] | 80 |
| 6 | Essence and Existence [De Ente et Essentia, complete] | 90 |
| III | The Ladder of Being | 115 |
| 7 | General Overview [Summa contra Gentiles, 4.11] | 115 |
| 8 | How Elements are Present within Compounds [De Mixtione Elementorum, complete] | 117 |
| 9 | Life, or Soul and its Abilities [Quaestio Disputata de Spiritualibus Creaturis, 11] | 121 |
| 10 | Levels of Life [Quaestio Disputata de Anima, 13] | 129 |
| 11 | Inner and Outer Senses [Sentencia Libri de Sensu (De Memoria)] | 138 |
| 12 | Mind (a) [Summa Theologiae, 1a.79.2-3] | 145 |
| 13 | Mind (b) [Summa contra Gentiles, 2.77] | 150 |
| 14 | Mind (c) [Quaestiones Disputatae de Veritate, 8.6] | 152 |
| 15 | Feelings [Summa Theologiae, 1a2ae.22-3] | 156 |
| 16 | Will as Rational Desire [Summa contra Gentiles, 2.47-8] | 169 |
| 17 | Free Will [Quaestiones Disputatae de Malo, 6] | 171 |
| 18 | Soul in Human Beings [Quaestio Disputata de Anima, 1] | 184 |
| 19 | My Soul is not Me [Super Epistolam Primam Pauli Apostoli ad Corinthios, 15] | 192 |
| IV | God In Himself | 195 |
| 20 | There Exists a God [Summa Theologiae, 1a.2.1-3] | 195 |
| 21 | God is his Own Existence [Quaestiones Disputatae de Potentia, 7.2] | 202 |
| 22 | Eternity and Time [Summa Theologiae, 1a.10.1, 4] | 209 |
| 23 | Do we Have Words for God? [Summa Theologiae, 1a.13.1-6, 12] | 214 |
| 24 | How we Know One Simple God by Many Concepts [Super I Sententiarum, 2.1.3] | 230 |
| 25 | How God Knows Many Things by One Simple Idea [Summa contra Gentiles, 1.50, 53] | 240 |
| 26 | God's Power [Quaestiones Disputatae de Potentia, 1.3, 7] | 242 |
| V | God as the Beginning of Things | 251 |
| 27 | Creation as God's Doing [Quaestiones Disputatae de Potentia, 3.1-3] | 251 |
| 28 | Did Creation Occur in Time? [Quaestiones Disputatae de Potentia, 3.17] | 263 |
| 29 | Providence (a): The Ordered Universe [Summa contra Gentiles, 3.97-8] | 270 |
| 30 | Providence (b): Chance and Freedom [In Aristotelis Librum Peri Hermeneias, 1.14] | 277 |
| 31 | Providence (c): How Evil is Caused [Summa contra Gentiles, 3.10] | 284 |
| 32 | Providence (d): Does God Cause Evil? [Quaestiones Disputatae de Malo, 3.1-2] | 289 |
| 33 | Is God at Work in Nature and in Will? [Quaestiones Disputatae de Potentia, 3.7-8] | 297 |
| VI | God as the End of Things | 315 |
| 34 | God as Goal of Human Living [Super IV Sententiarum, 49.1] | 315 |
| 35 | Moral Action [Summa Theologiae, 1a2ae.18-20] | 342 |
| 36 | Virtue [Summa Theologiae, 1a2ae.55-6] | 390 |
| 37 | Law [Summa Theologiae, 1a2ae.90-1] | 409 |
| 38 | Love of God as Virtue [Quaestio Disputata de Caritate, 2] | 421 |
| Notes | 426 |
| Index | 447 |