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

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

Poincaré was a vigorous opponent of the theory that all mathematics can be rewritten in terms of the most elementary notions of classical logic; something more than logic, he believed, makes mathematics what it is.

The only royal road to elementary geometry is ingenuity.

The longer mathematics lives the more abstract - and therefore, possibly also the more practical - it becomes.

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

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