Why this theme matters
Across 4 recurring voices here (notably René Descartes and John Dewey), certainty is framed through Rationalism and Pragmatism. Some passages define certainty; others warn how it fails; still others relocate it inside habit, community, or language.
In the history of philosophy
Discussions of certainty travel through European modern and modern European traditions. Compare the quotations below with their school labels rather than forcing a single definition.
Thinkers in this collection
René Descartes , John Dewey , Voltaire , Al-Ghazali
Frequently asked questions
What did philosophers say about certainty?
They disagreed in productive ways. In this archive, René Descartes, John Dewey, and related voices treat certainty as something to clarify, cultivate, or critique—not merely to celebrate.
Where can I find philosophy quotes about certainty?
This theme page gathers 6 verified English quotations tagged Certainty, with links to thinkers and sources.
How should I read quotes about certainty?
Read the sentence, then check school and source. A compact line is an entry point into an argument about certainty, not a substitute for the surrounding text.