A total absence of self-doubt is the first sign of insanity.

“There is nothing that is more certain sign of insanity than to do the same thing over and over and expect the results to…

— Albert Einstein

Increasingly constructive doubt is the sign of advancing civilization. We must put question marks along many of our inherited legal dogmas, since they are…

— Jerome Frank

Doubt is not always a sign that a man is wrong; it may be a sign that he is thinking.

— Oswald Chambers

“Laughter isn't a sign of insanity but a shield against it.”

— Richelle E. Goodrich

“Expectations are the first sign of insanity.”

— Adam Spielman

Silence is not the absence of sound, but the absence of self.

— Anthony de Mello

“The self cannot survive without love, and the self, starved of love, dies. The absence of self-love is shame, "just as cold is the…

— Gregory Boyle

Courage is not the absence of fear; it is the absence of self.

— Erwin McManus

“I have no parents I make the heavens and earth my parents I have no home I make awareness my home I have no…

— Joseph Goldstein

Have faith in your skills, negative thoughts kill. Self-doubt will kill your dreams before others do. Doubt kills more dreams than failure ever will.

— Suzy Kassem

At the level at which I work with people, their great talent is paired with great insecurity. Self-doubt is literally the twin of self-confidence.…

— William Ivey Long

Creativity requires introspection, self-examination, and a willingness to take risks. Because of this, artists are perhaps more susceptible to self-doubt and despair than those…

— Eric Maisel

“If anything defeated her, it would be her own mind and self-doubt.”

— Cat Johnson

Opportunity is always knocking. The problem is that most people have the self-doubt station in their head turned up way too loud to hear…

— Brian Vaszily

I have many moments of self doubt. Everybody does.

— Margot Robbie