“I never have the nagging doubt of wondering whether perhaps I am wrong.”

“Life is merely terrible; I feel it as few others do. Often — and in my inmost self perhaps all the time — I doubt whether I am a human being.”

“When you’re young you never doubt yourself. You never wonder if you’re justified. But as a man gets older he learns to doubt. Whether he can do a thing—whether he should.”

“I do not know why the dead do not come back to life. Perhaps death is so wonderful, in ways we cannot comprehend, that they prefer it over and above their friends and loved ones, although I am inclined to doubt that be the case.”

“I am full of doubts … Each new film is like a trial. Before I step in front of the camera, I do not know whether I am going to fall or whether I am going to fly — and that is exactly the way I want it to stay.”

“I know. In fact, I am never wrong.”

“I've got to start listening to those quiet, nagging doubts.”

“Now I must, I suppose, explain why I have been writing this account. […] I have written to disclose myself to myself, and I am writing now because I will, I know, sometime read what I am now writing and wonder. Perhaps by the time I do, I will have solved the mystery of myself, or perhaps I will no longer care to know the solution.”

“Every day I wonder how many things I am dead wrong about. -- True North”

“I am all in a sea of wonders. I doubt; I fear; I think strange things, which I dare not confess to my own soul.”