Contents -- Introduction -- 1. The Ethica from Manuscript to Prohibition -- 1.1. The Frontispiece -- 1.2. The Genesis of the Text -- 1.3. Niels Stensen's Denunciation of Spinoza in 1677 -- 1.4. The Lutheran Foreigner -- 1.5. The Ethica on the Index -- 2. The Manuscript Vat. Lat. 12838 -- 2.1. Description -- 2.2. Transcription and Notes -- 2.3. Recurring Abbreviations -- 3. Vat. Lat. 12838 and Opera posthuma -- 3.1. Variants, Errors, and Harmonization -- 3.1.1. Slight Variations -- 3.1.2. Internal References -- 3.1.3. Probable Errors -- 3.1.4. Word Order -- 3.1.5. Different Wordings -- 3.1.6. Omissions and Additions in Opera posthuma -- 3.1.7. Harmonization in Opera posthuma -- 3.2. Evaluation -- Chronology -- Appendix -- I. Printed Pages in Vat. Lat. 12838 -- II. Niels Stensen's Denunciation of Spinoza's Philosophy to the Holy Office -- III. Fragment of Giovanni Cristoforo Battelli's Censura of Christian Kortholt, De tribus impostoribus -- Bibliography -- Transcription -- Pars Prima de Deo -- Pars Secunda de Naturâ et Origine Mentis -- Pars Tertia de Origine et Naturâ Affectuum -- Pars Quarta de Servitute humanâ seu de affectuum viribus -- Pars Quinta de Potentiâ intellectus seu de libertate humanâ.