Who said "A man who does not think for himself does not think at all."?

This quote is attributed to Oscar Wilde.

A man who does not think for himself does not think at all. - Oscar Wilde

"A man who does not think for himself does not think at all."

Oscar Wilde Knowledge

Playwright Poet Irish 1854–1900

"Be yourself; everyone else is already taken."

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

"I can resist everything except temptation."

"The truth is rarely pure and never simple."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."