| Notes on Style | |
| Preface | |
| Introduction | |
| Pt. A | Background for St. Thomas's Treatise on Law | |
| Ch. I | Introduction to St. Thomas | |
| Sect. 1 | St. Thomas Aquinas | |
| Sect. 2 | St. Thomas and Jurisprudence | 5 |
| Sect. 3 | On Reading St. Thomas | 8 |
| Sect. 4 | The Structure of the Summa Theologiae | 11 |
| Sect. 5 | Scholasticism | 14 |
| Sect. 6 | St. Thomas's Approach to the Study of Law | 17 |
| Ch. II | The Nature of Definition and the Art of Defining | 20 |
| Sect. 1 | Introduction | 20 |
| Sect. 2 | The Nature of Definition | 21 |
| Sect. 3 | Types of Definition | 22 |
| Sect. 4 | The Ambiguity of Words | 26 |
| Sect. 5 | The Central Case | 31 |
| Sect. 6 | A Further Note on the Ambiguity of Words | 33 |
| Sect. 7 | On Analyzing and Evaluating a Definition of "Law" | 34 |
| Ch. III | General Doctrinal Background for the Treatise | 38 |
| Sect. 1 | Introduction | 38 |
| Sect. 2 | The Doctrine of the Four Causes | 40 |
| Sect. 3 | St. Thomas's World View | 45 |
| Sect. 4 | "Nature" and "Essence" | 48 |
| Sect. 5 | Human Nature | 54 |
| Sect. 6 | The Nature of Human Acts | 57 |
| Sect. 7 | "Rule and Measure" | 59 |
| Sect. 8 | Habit | 60 |
| Sect. 9 | The Speculative Intellect, the Practical Intellect, and Right Reason | 62 |
| Sect. 10 | Voluntarism vs. Practical Reasonableness | 65 |
| Sect. 11 | The Virtues | 66 |
| Sect. 12 | Happiness: The Last End of Man | 76 |
| Sect. 13 | The Common Good | 79 |
| Sect. 14 | Obligation | 81 |
| Sect. 15 | A Synopsis of St. Thomas's Doctrine of Natural Law | 85 |
| Ch. IV | St. Thomas's Sources and His Use of Them | 94 |
| Sect. 1 | The Use of Auctoritates | 94 |
| Sect. 2 | The Auctores Quoted in the Treatise | 103 |
| Pt. B | St. Thomas Aquinas: The Treatise on Law [Being Summa Theologiae, I-II, QQ. 90 Through 97] | |
| Question 90: De Essentia Legis | 118 |
| Article 1 | 118 |
| Article 2 | 127 |
| Article 3 | 135 |
| Article 4 | 140 |
| Question 91: De Legum Diversitate | 148 |
| Article 1 | 150 |
| Article 2 | 155 |
| Article 3 | 160 |
| Article 4 | 166 |
| Article 5 | 172 |
| Article 6 | 178 |
| Question 92: De Effectibus Legis | 185 |
| Article 1 | 185 |
| Article 2 | 192 |
| Question 93: De Lege Aeterna | 199 |
| Article 1 | 199 |
| Article 2 | 206 |
| Article 3 | 210 |
| Article 4 | 215 |
| Article 5 | 222 |
| Article 6 | 227 |
| Question 94: De Lege Naturali | 235 |
| Article 1 | 235 |
| Article 2 | 241 |
| Article 3 | 251 |
| Article 4 | 256 |
| Article 5 | 264 |
| Article 6 | 270 |
| Question 95: De Lege Humana Secundum Se | 276 |
| Article 1 | 276 |
| Article 2 | 283 |
| Article 3 | 289 |
| Article 4 | 296 |
| Question 96: De Potestate Legis Humanae | 305 |
| Article 1 | 305 |
| Article 2 | 311 |
| Article 3 | 316 |
| Article 4 | 321 |
| Article 5 | 329 |
| Article 6 | 336 |
| Question 97: De Mutatione Legum | 342 |
| Article 1 | 343 |
| Article 2 | 348 |
| Article 3 | 353 |
| Article 4 | 360 |
| About the Translator | 367 |