Euclid taught me that without assumptions there is no proof. Therefore, in any argument, examine the assumptions.

Even stranger things have happened; and perhaps the strangest of all is the marvel that mathematics should be possible to a race akin to the apes.

If indeed, as Hilbert asserted, mathematics is a meaningless game played with meaningless marks on paper, the only mathematical experience to which we can refer is the making of marks on paper.

I have always hated machinery, and the only machine I ever understood was a wheelbarrow, and that but imperfectly.

Any impatient student of mathematics or science or engineering who is irked by having algebraic symbolism thrust upon him should try to get along without it for a week.

Galois read the geometry from cover to cover as easily as other boys read a pirate yarn.

Time makes fools of us all. Our only comfort is that greater shall come after us.