Who said "The man who fails to prepare is preparing to fail."?

This quote is attributed to Jack London.

The man who fails to prepare is preparing to fail. - Jack London

"The man who fails to prepare is preparing to fail."

Jack London Leadership

Novelist American 1876–1916

"The proper function of man is to live, not to exist."

"I would rather be ashes than dust."

"You can't wait for inspiration. You have to go after it with a club."

"The wise man doesn't give the right answers, he possesses the right questions."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"