Who said "Action and reaction are equal and opposite directions."?

This quote is attributed to Gertrude Stein.

Action and reaction are equal and opposite directions. - Gertrude Stein

"Action and reaction are equal and opposite directions."

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."