The First Meditation uses a method of withholding assent from prior opinions whenever there is any reason for doubt.
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This sentence is an editorial paraphrase linked to the listed sources, not a direct quotation.
Meditationes de prima philosophia
René Descartes · 1641 · Adam–Tannery VII, Corpus Descartes digital edition with page markers and original-edition images
Locator: Meditation I, AT VII 17–18
Open sourceDescartes' Epistemology
Stanford Encyclopedia of Philosophy
Locator: Section 2.2
Open source