“I doubt, therefore I think, therefore I am.”
Variant: Dubito, ergo cogito, ergo sum.
(English: "I doubt, therefore I think, therefore I am")
Original
Cogito, ergo sum.
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René Descartes 47
French philosopher, mathematician, and scientist 1596–1650Related quotes

“I think I am, therefore I am. I think.”
Books, Napalm and Silly Putty (2001)

Je pense, donc je suis.
Le Discours de la Méthode (1637)
Variant: I think, therefore I am.

Degrees: Thought Capsules and Micro Tales (1989)

“I think, therefore I am … not a Christian.”
Ich denke, also bin ich kein Christ.
Bissige Aphorismen, S. 35
“I think... therefore I am annoyed.”
Daily strip for November 17, 2007
Bucky Katt
Source: The Eclipse: A Memoir of Suicide (2004), P. 54.
Source: Break-Out from the Crystal Palace (1974), p. 40