Who said "The shadow is as much a part of the man as the light."?

This quote is attributed to William Butler Yeats.

The shadow is as much a part of the man as the light. - William Butler Yeats

"The shadow is as much a part of the man as the light."

William Butler Yeats Philosophy

Poet Playwright Irish 1865–1939

"The best way to live is to act as if you are already dead."

"Do not wait to strike till the iron is hot; but make it hot by striking."

"There are no strangers here; only friends you haven't yet met."

"How can we know the dancer from the dance?"

"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."