Principles of Philosophy

Descartes’ attempt, published in Latin in 1644, to lay out an entire system in textbook form: four parts running from the principles of human knowledge through the nature of matter, the visible universe, and the earth. Part one restates the argument the Meditations had made — that the one thing methodical doubt cannot dissolve is the doubter, and that certainty must be rebuilt from there. The three parts that follow are the payoff he actually cared about: a physics with no purposes in it, in which everything that happens is matter in motion governed by a few laws, planets carried in vortices of fine matter, and no appeal to the ends or natures that scholastic explanation ran on. The physics did not survive Newton. The method — begin from what cannot be doubted, admit only mechanical causes, write it as a system — is roughly the shape modern science took.

Why it’s on the list: Li Lu’s walk through Western civilisation goes Plato, Augustine, Descartes, Freud. Descartes is the hinge: the point where the authority for a claim moves from the tradition that hands it to you to the individual mind that can check it. Everything on the list about scientific method and about markets as knowledge-processing systems inherits from that move.

Where I saw it: On Li Lu’s Recommended Book List, the 137-entry Himalaya Capital bibliography, in the section on History of Western Civilization. Kyle saved the list as two X posts that photographed only the value-investing section; this entry came out of the source PDF, which gives no year or publisher for it.

Connections

• Descartes — the author.
• Doubt — used here as a method rather than a mood.
• Epistemology — the part-one question: what may be counted as known, and on whose authority.
• Science — the mechanical, purpose-free physics this book tried to found.
• Philosophy — the systematising instinct, in its most explicit form.
• Li Lu · Himalaya Capital — the curator and the bibliography.