Who said "A man who cannot laugh at himself is a fool."?

This quote is attributed to Alfred Adler.

A man who cannot laugh at himself is a fool. - Alfred Adler

"A man who cannot laugh at himself is a fool."

Alfred Adler Humor

Psychologist Austrian 1870–1937

"Courage is not the absence of fear, but rather assessment that something else is more important than fear."

"The greatest invention is imagination."

"We are not determined by our heredity and environment; we make ourselves."

"Everybody can be significant, because everybody can serve."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."