The important thing is not to stop questioning.

My favorite question that is asked only of women is, 'What do you do with yourself all day?' The only possible answer is, 'Make nuclear bombs in my bathroom. Just little ones, though.'

The power to question is the basis of all human progress.

Computers are useless. They can only give you answers.

There ain't no answer. There ain't going to be any answer. There never has been an answer. That's the answer.

Do not question too much, lest your head fall off. In truth, you are questioning too much about a divinity about which further questions cannot be asked.

Ah! What is man? Wherefore does he why? Whence did he whence? Whither is he dithering?

Who am I? How did I come into the world? Why was I not consulted?

Where does my fist go when I open up my hand? Where does my lap go when I stand up?

If blind people wear sunglasses, why don't deaf people wear earmuffs?