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Primary sourceBook1677 (written earlier, published posthumously)

Tractatus de Intellectus Emendatione

Benedictus de Spinoza · 1677 (written earlier, published posthumously)

Spinoza's unfinished early treatise on knowledge and the improvement of the understanding, published after his death in 1677.

This unfinished treatise, published after his death by friends, opens with Spinoza's own account of why he turned to philosophy.

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Title page of the Latin text Tractatus De Intellectus Emendatione, in a 17th-century printed typeface, with a subtitle in Latin and an opening paragraph beginning with a large decorated initial letter P.
Benedictus de Spinoza, Tractatus de Intellectus Emendatione, in Opera Posthuma, 1677.

About this source

What it is

This is an unfinished philosophical work by Benedictus de Spinoza, published in 1677, the year he died, by his close friends alongside his other writings. It explores how the mind can form clear and distinct ideas, discussing perception, memory, doubt and definition.

Why it matters

The treatise shows Spinoza wrestling with questions of knowledge that run through all his philosophy, where understanding and ethical living are closely tied together. Its famous opening, in which the author describes turning away from wealth, honour and pleasure to search for the true good, gives a rare glimpse of his personal motivations. That it was never finished, and only printed by his friends after his death, shows how his ideas reached the world mainly through the people who trusted and protected his work.

Look closer

  • Why might an author leave a work unfinished, and what might that tell us about his priorities?
  • What does the opening passage suggest about why Spinoza turned to philosophy?
  • Why was this published by friends rather than by Spinoza himself?

This book is part of the curated material that grounds the AI version of Baruch Spinoza on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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Title page of Spinoza's Ethica in Latin. Large capital letters read ETHICA, followed by 'Ordine Geometrico demonstrata, ET In quinque Partes distincta, in quibus agitur', then a list of five parts numbered I to V with Latin titles.Book

Primary source

Ethics

Benedictus de Spinoza · 1677 (written 1661-1675)

Title page of the Tractatus Theologico-Politicus, printed in black letter-style serif type with a handwritten inscription 'Auctore Benedicto de Spinoza' and an ornamental woodcut at the bottom, imprint reading Hamburgi, Apud Henricum Kuhrabt, 1670.Book

Primary source

Tractatus Theologico-Politicus

Benedictus de Spinoza · 1670

Oil painting of a man with long dark curly hair, wearing a dark coat and a large white collar, against a dark brown background. He looks toward the viewer with a calm expression.Painting

Primary source

Portrait of Benedictus de Spinoza

Unknown · c. 1665

Title page of a book. At top: 'B. D. S.' Large capitals below read 'OPERA POSTHUMA,' followed by italic Latin text 'Quorum series post Praefationem exhibetur.' A small woodcut ornament of fruit and ribbons sits in the middle, and at the bottom is the date 'MDCLXXVII' written as 'CIO IC CLXXVII' style Roman numerals.Book

Primary source

Opera Posthuma

Benedictus de Spinoza · 1677

Title page of a 1677 book in Latin. Large capitals read EPISTOLAE, followed by DOCTORUM QUORUNDAM VIRORUM, AD B. D. S. ET AUCTORIS RESPONSIONES, and a line about elucidating other works. Faded text from another page shows through in the background.Letter

Primary source

Epistolae, Correspondence of Benedict de Spinoza

Benedictus de Spinoza · 1661-1676, published 1677

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