It's always too early to quit.
Be thine own palace, or the world's thy jail.
Only the educated are free.
To be a good loser is to learn how to win.
The wise does at once what the fool does at last.
Be gentle to all and stern with yourself.
Leap, and the net will appear.
Either you run the day or the day runs you.
By failing to prepare, you are preparing to fail.
If you've got a talent, protect it.
The human imagination has already come to conceive the possibility of recreating human society.
The product of the scientific imagination is a new vision of relations - like that of artistic imagination.