I may doubt the existence of everything else, but I cannot d... - René Descartes

This quote is attributed to René Descartes.

"I may doubt the existence of everything else, but I cannot doubt my own existence as a thinking being."

René Descartes Truth

Philosopher and Mathematician French 1596–1650

More from René Descartes

"I think, therefore I am."

"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

"The greatest minds are capable of the greatest vices as well as of the greatest virtues."

"Doubt is the key to knowledge."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."