Success in business requires training and discipline and hard work. But if you're not frightened by these things, the opportunities are just as great today as they ever were.

The art of government is not to let me grow stale.

Pure mathematics is, in its way, the poetry of logical ideas.

All things change; nothing perishes.

Courage doesn’t mean you don’t get afraid.

Life is thickly sown with thorns, and I know no other remedy than to pass quickly through them. The longer we dwell on our misfortunes, the greater is their power to harm us

There's no greater challenge and there is no greater honor than to be in public service.