Mathematics is a dangerous profession; an appreciable proportion of us go mad.

The surprising thing about this paper is that a man who could write it would.

The referee said it was not acceptable, but the Press considered they could not refuse to publish a book by a professor of the university.

A precisian professor had the habit of saying: "... quartic polynomial ax^4+bx^3+cx^2+dx+e , where e need not be the base of the natural logarithms."

It is true that I should have been surprised in the past to learn that Professor Hardy had joined the Oxford Group. But one could not say the adverse chance was 1:10. Mathematics is a dangerous profession; an appreciable proportion of us go mad, and then this particular event would be quite likely.

The first test of potential in mathematics is whether you can get anything out of geometry.

I read in the proof sheets of Hardy on Ramanujan: "As someone said, each of the positive integers was one of his personal friends." My reaction was, "I wonder who said that; I wish I had." In the next proof-sheets I read (what now stands), "It was Littlewood who said..."