It takes an extraordinary intelligence to contemplate the obvious.

Algebra reverses the relative importance of the factors in ordinary language.

An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.

The study of mathematics is apt to commence in disappointment... We are told that by its aid the stars are weighed and the billions of molecules in a drop of water are counted. Yet, like the ghost of Hamlet's father, this great science eludes the efforts of our mental weapons to grasp it.

I would be a billionaire if I was looking to be a selfish boss. That's not me.

We think in generalities, but we live in detail.

We must not expect simple answers to far-reaching questions. However far our gaze penetrates, there are always heights beyond which block our vision.