# Quote — Rene Descartes, Principles of Philosophy

> In order to seek truth, it is necessary once in the course of our life, to doubt, as far as possible, of all things.

- Author: [Rene Descartes](https://www.leafyquotes.com/rene-descartes.md)
- Book: [Principles of Philosophy](https://www.leafyquotes.com/rene-descartes/principles-of-philosophy.md)
- Source: [Wikiquote](https://en.wikiquote.org/wiki/Ren%C3%A9_Descartes#Principles_of_Philosophy_(1644)) ([CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/))
- Topics: [truth](https://www.leafyquotes.com/topics/truth.md), [doubt](https://www.leafyquotes.com/topics/doubt.md)
- Quote page: https://www.leafyquotes.com/rene-descartes/principles-of-philosophy/in-order-to-seek