These critical thinking quotes are real and attributed, sorted by theme: questioning what you’re told, holding doubt, and thinking independently. Each is credited to a named source, which matters more than usual here, since quotes about clear thinking lose their point when they’re misattributed. Use them for a classroom, an essay, or a lesson on evaluating sources.
On questioning and evaluating ideas
The core of critical thinking: examining a claim before accepting it.
“It is the mark of an educated mind to be able to entertain a thought without accepting it.” — attributed to Aristotle
“The important thing is not to stop questioning. Curiosity has its own reason for existing.” — Albert Einstein
“The eye sees only what the mind is prepared to comprehend.” — Henri Bergson
On doubt and certainty
These warn against being too sure too fast.
“The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.” — Bertrand Russell
“Doubt is not a pleasant condition, but certainty is absurd.” — Voltaire
On independent thinking
For thinking for yourself rather than following the crowd.
“Think for yourselves and let others enjoy the privilege to do so, too.” — Voltaire
“The essence of the independent mind lies not in what it thinks, but in how it thinks.” — Christopher Hitchens
For related themes, see quotes about learning and education quotes.
Why attribution matters here
Quotes about clear thinking are ironic to misattribute, and several common ones are shaky. The “entertain a thought without accepting it” line is universally credited to Aristotle but does not appear verbatim in his surviving work, so present it as attributed rather than sourced. When a quote’s whole point is careful thinking, checking its origin is part of using it honestly, which is a good lesson in itself. For using quotes in student work, see how to introduce a quote.
FAQ
What is a good quote about critical thinking?
Bertrand Russell’s line about fools being certain and wise people full of doubts is a strong, correctly attributed choice. Aristotle’s “entertain a thought without accepting it” is popular but only loosely sourced.
Did Aristotle really say “the mark of an educated mind”?
It is universally credited to him but does not appear word-for-word in his surviving texts, so treat it as attributed rather than a verified quotation.
What quote fits a lesson on evaluating sources?
Christopher Hitchens’s “The essence of the independent mind lies not in what it thinks, but in how it thinks” ties directly to judging how a claim is reasoned, not just what it says.
How should students use these quotes?
As a discussion starter or an essay epigraph, with the source named. Checking a quote’s origin before using it is itself a critical-thinking exercise.
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