Who said "Human nature is not black and white but black and grey."?

This quote is attributed to Gertrude Stein.

Human nature is not black and white but black and grey. - Gertrude Stein

"Human nature is not black and white but black and grey."

Gertrude Stein Philosophy

Novelist Poet American 1874–1946

"A rose is a rose is a rose."

"There is no there there."

"Everybody gets so much information all day long that they lose their common sense."

"You are all a lost generation."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."