Wrong hypotheses, rightly worked from, have produced more useful results than unguided observations.

The moving power of mathematical invention is not reasoning but imagination.

I did not hear what you said, but I absolutely disagree with you.

I was x years old in the year x2.

But the gambling reasoner is incorrigible: if he would but take to squaring the circle, what a load of misery would be saved.

Mathematicians care no more for logic than logicians for mathematics.

I don't quite hear what you say, but I beg to differ entirely with you.

It should seem that it is easier to square the circle than to get round a mathematician.

Common integration is only the memory of differentiation.

The sacred writings excepted, no Greek has been so much read and so variously translated as Euclid.

As to writing another book on geometry [to replace Euclid] the middle ages would have as soon thought of composing another New Testament.

You can do amazing things when people love you.

I like to go into the studio and start work on a project when it's time. I don't like to do it too early or too late.

Come, live with the doors of the senses guarded, diligent and mindful, vigilant and mindful, with the ways of the mind well watched, possessed of a mind that is awake and observing.

To say that a man is an idealist is merely to say that he is a man.

Everyone has his besetting sin.

We are on a very rich emotional and physical journey on this planet.

Believe me, you lose more than a gallon of fluids during a race. You could lose between six and 10 pounds during a race, depending on hot it is.

The best way to hold customers is to constantly figure out how to give them more for less.

Sympathy constitutes friendship; but in love there is a sort of antipathy, or opposing passion. Each strives to be the other, and both together make up one whole.

When torrential water tosses boulders, it is because of its momentum. When the strike of a hawk breaks the body of its prey, it is because of timing.