Who said "What we think, we become."?

This quote is attributed to Walter Matthau.

What we think, we become. - Walter Matthau

"What we think, we become."

Walter Matthau

Actor Journalist American 1920–2000

"The only way to deal with an unfree world is to become so absolutely free that very existence is an act of rebellion."

"Age is no barrier. It's a limitation you put on your mind."

"Entertain the thought, but don't marry it."

"I think the key to life is just persistence."