“Doubt was much more energy efficient than conviction.”

“Doubt requires more courage than conviction does, and more energy; because conviction is a resting place and doubt is infinite – it is a passionate exercise. You may come out of my play uncertain. You may want to be sure. Look down on that feeling. We’ve got to learn to live with a full measure of uncertainty. There is no last word. That’s the silence under the chatter of our time. ”

“It is much more comfortable to be mad and know it, than to be sane and have one's doubts.”

“Our greatest challenge today...is to couple conviction with doubt. By conviction, I mean some pragmatically developed faith, trust, or centeredness; and by doubt I mean openness to the ongoing changeability, mystery, and fallibility of the conviction.”

“Convictions are more dangerous foes of truth than lies.”

“The construction of life is at present in the power of facts far more than of convictions, and of such facts as have scarcely ever become the basis of convictions.”