René Descartes
René Descartes (31 March 1596 – 11 February 1650) was a French philosopher, scientist, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science.[1]
Quotes·Quotations by René Descartes
¶ I think, therefore I am.
https://en.wikipedia.org/wiki/Ren%C3%A9_Descartes