Who said "The soul grows by what it eats."?

This quote is attributed to Jack London.

The soul grows by what it eats. - Jack London

"The soul grows by what it eats."

Jack London

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."