Who said "I think I am, therefore I am."?

This quote is attributed to Samuel Beckett.

I think I am, therefore I am. - Samuel Beckett

"I think I am, therefore I am."

Samuel Beckett

Playwright Novelist Irish 1906–1989

"All that is needed is a little patience."

"Nothing to be done."

"I can't go on, I'll go on."

"Ever tried. Ever failed. No matter. Try again. Fail again. Fail better."