Who said "Patience with the work leads to mastery."?

This quote is attributed to William Carlos Williams.

Patience with the work leads to mastery. - William Carlos Williams

"Patience with the work leads to mastery."

William Carlos Williams Patience

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."

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."