| Translator's Preface | |
| Acknowledgments | |
| Abbreviations | |
| Introduction to the Four-Seven Debate | |
| Background | |
| The Four-Seven Debate | |
| The Toegye-Kobong Debate | |
| The Yulgok-Ugye Debate | |
| The Importance of the Four-Seven Debate | |
| 1 | Toegye's Letter to Kobong | 1 |
| 2 | Kobong's Letter to Toegye on the Four Beginnings - Seven Feelings Thesis | 3 |
| 3 | Toegye's Reply to Kobong Arguing the Distinction of the Four Beginnings and Seven Feelings in Terms of Principle and Material Force | 7 |
| 4 | Kobong's Response to Toegye's Letter Discussing the Four Beginnings and Seven Feelings | 17 |
| Postscript | 43 |
| 5 | Toegye's Reply to Kobong's Critique of Distinguishing the Four Beginnings and Seven Feelings in Terms of Principle and Material Force, with a Revised version of His First Letter | 49 |
| Revised Draft of Toegye's First Letter | 49 |
| Second Letter Replying to Kobong's Critique | 57 |
| 6 | Kobong's Response to the Second Letter | 81 |
| 7 | Kobong's Postscript Explanation of the Four Beginnings and Seven Feelings | 101 |
| 8 | Kobong's General Summary of the Four Beginnings and Seven Feelings | 105 |
| 9 | Ugye's First Letter to Yulgok on the Four-Seven Debate | 109 |
| 10 | Yulgok's Response to Ugye's First Letter | 113 |
| 11 | Yulgok's Response to Ugye's Second (Missing) Letter | 117 |
| 12 | Ugye's Third Letter to Yulgok | 121 |
| 13 | Yulgok's Response to Ugye's Third Letter | 125 |
| 14 | Ugye's Fourth Letter to Yulgok | 139 |
| 15 | Yulgok's Reply to Ugye's Fourth Letter | 145 |
| 16 | Ugye's Fifth Letter to Yulgok | 159 |
| 17 | Yulgok's Reply to Ugye's Fifth Letter | 163 |
| 18 | Ugye's Sixth Letter to Yulgok | 167 |
| 19 | Yulgok's Reply to Ugye's Sixth Letter | 173 |
| Letter on Principle and Material Force | 175 |
| Notes | 185 |
| Glossary | 201 |
| Selected Bibliography | 203 |
| Index | 205 |