What science can there be more noble, more excellent, more useful for men, more admirably high and demonstrative, than this of mathematics?

It is better to let 100 criminals go free than to imprison 1 innocent man.

Kill no more pigeons than you can eat.

Let every one ascertain his special business and calling, and then stick to it if he wants to be successful.

The world is full of fools and faint hearts; and yet everyone has courage enough to bear the misfortunes, and wisdom enough to manage the affairs, of his neighbor.

All mankind is divided into three classes: those that are immovable, those that are movable, and those that move.

Industry and patience are the surest means of plenty.