Who said "To teach is to learn twice over."?

This quote is attributed to René Descartes.

To teach is to learn twice over. - René Descartes

"To teach is to learn twice over."

René Descartes Education

Philosopher and Mathematician French 1596–1650

"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."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."