René Descartes

"Cogito ergo sum"

i.e. "I think, therefore I am."

- René Descartes, philosopher, mathematician, writer

Descartes was a French philosopher who coined this well-known phrase. Descartes originally wrote it in French ("Je pense donc je suis") and it has since become a fundamental concept in philosophy. Simply put, Descartes reasoned that a person who wonders whether or not he exists must in fact exist by virtue of the fact that he wonders whether or not he exists.

René Descartes

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

- René Descartes, philosopher, mathematician, writer