I do not know. [summarising his life's work]

If I had inherited a fortune I should probably not have cast my lot with mathematics.

It took the mob only a moment to remove his head; a century will not suffice to reproduce it.

The ordinary operations of algebra suffice to resolve problems in the theory of curves.

It has cost them but a moment to cut off that head; but a hundred years will not be sufficient to produce another like it.

Newton was the greatest genius that ever existed, and the most fortunate, for we cannot find more than once a system of the world to establish.

Sometimes you do not like the situation. But you have to endure for awhile.

Coming to terms with the fact that my marriage was a failure was devastating and very difficult. I blamed myself for a lot of things. It took me a very long time to get over it.

If you don't believe one person can make a difference, you have never been in bed with a mosquito.

Make sure you have legal cover for what you're doing.

So let us not worry, and look instead as it has been taught us to do, as the birds of the air and the lilies of the field, keeping complete faith in Our Father's goodness.

I've traveled more than any human being who's ever lived.

Do thine own task, and be therewith content.

There's not enough of those inclusive projects where I feel like I'm interpreting a human being and not just a statistic or a nationality.

I'm very influenced by a lot of things, but my chief influence is my friends and what I see and what I feel and my own experiences and memory.

History is and should be a science.