If you spend too much time thinking about a thing, you'll never get it done.

If everybody is thinking alike, then somebody isn't thinking.

He who thinks little, errs much.

A public-opinion poll is no substitute for thought.

To know what people really think, pay regard to what they do, rather than what they say.

I think, therefore I am.

I do not paint the things I see, I paint what I think.

We begin to think cosmically.

The scientists from Franklin to Morse were clear thinkers and did not produce erroneous theories. The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.

At 7 a.m. all my voices start talking inside my head, and when it reaches a certain pitch I jump out and trap them before they're gone. Or I shower and then the voices talk. You solve problems not by thinking directly of them but allowing them to ferment in their own time.