Who said "A poet must write about what he knows and what he sees."?

This quote is attributed to William Carlos Williams.

A poet must write about what he knows and what he sees. - William Carlos Williams

"A poet must write about what he knows and what he sees."

William Carlos Williams Creativity

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."

"When life gives you lemons, make something beautiful."

"Creativity knows no bounds."

"Creativity is the expression of the soul."

"I'm making this up as I go."