Who said "The strength of a man is not in his muscles but in his will."?

This quote is attributed to William Carlos Williams.

The strength of a man is not in his muscles but in his will. - William Carlos Williams

"The strength of a man is not in his muscles but in his will."

William Carlos Williams Strength

Poet Physician American 1883–1963

"So much depends upon a red wheel barrow glazed with rain water beside the white chickens."

"The pure products of America go crazy."

"No ideas but in things."

"I have discovered that most of the things I've done, I've done for the sake of their form."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."