| PAGE |
| Introduction by Anton Pannekoek | [7] |
| The Nature of Human Brain Work | |
| | Preface | [41] |
| | I. Introduction | [47] |
| | II. Pure Reason or the Faculty of Thought in General | [61] |
| | III. The Nature of Things | [80] |
| | IV. The Practice of Reason in Physical Science | [104] |
| | a Cause and Effect | [108] |
| | b Matter and Mind | [119] |
| | c Force and Matter | [124] |
| | V. "Practical Reason" or Morality | [133] |
| | a The Wise and Reasonable | [133] |
| | b Morality and Right | [143] |
| | c The Holy | [156] |
| Letters on Logic | |
| | First Letter | [177] |
| | Second Letter | [181] |
| | Third Letter | [186] |
| | Fourth Letter | [191] |
| | Fifth Letter | [198] |
| | Sixth Letter | [205] |
| | Seventh Letter | [212] |
| | Eighth Letter | [217] |
| | Ninth Letter | [225] |
| | Tenth Letter | [230] |
| | Eleventh Letter | [236] |
| | Twelfth Letter | [242] |
| | Thirteenth Letter | [248] |
| | Fourteenth Letter | [255] |
| | Fifteenth Letter | [260] |
| | Sixteenth Letter | [265] |
| | Seventeenth Letter | [271] |
| | Eighteenth Letter | [277] |
| | Nineteenth Letter | [283] |
| | Twentieth Letter | [289] |
| | Twenty-first Letter | [296] |
| | Twenty-second Letter | [301] |
| | Twenty-third Letter (a) | [307] |
| | Twenty-third Letter (b) | [312] |
| | Twenty-fourth Letter | [318] |
| The Positive Outcome of Philosophy | |
| | Preface | [327] |
| | I. Positive Knowledge as a Special Object | [333] |
| | II. The Power of Perception Is Kin to the Universe | [337] |
| | III. As to How the Intellect Is Limited and Unlimited | [342] |
| | IV. The Universality of Nature | [348] |
| | V. The Understanding as a Part of the Human Soul | [354] |
| | VI. Consciousness Is Endowed With the Faculty of Knowing | |
| | as Well as With the Feeling of the Universality | |
| | of All Nature | [363] |
| | VII. The Relationship or Identity of Spirit and Nature | [369] |
| | VIII. Understanding Is Material | [376] |
| | IX. The Four Principles of Logic | [381] |
| | X. The Function of Understanding on the Religious Field | [393] |
| | XI. The Distinction Between Cause and Effect Is only | |
| | One of the Means to Facilitate Understanding | [401] |
| | XII. Mind and Matter: Which Is Primary, Which Is | |
| | Secondary? | [409] |
| | XIII. The Extent to Which the Doubts of the Possibility | |
| | of Clear and Accurate Understanding Have Been | |
| | Overcome | [418] |
| | XIV. Continuation of the Discussion on the Difference | |
| | Between Doubtful and Evident Understanding | [428] |
| | XV. Conclusion | [436] |