He who refuses to embrace a unique opportunity loses the prize as surely as if he tried and failed.
Do just once what others say you can't do, and you will never pay attention to their limitations again.
An impossibility does not disturb us until its accomplishment shows what fools we were.
The seeds of great discoveries are constantly floating around us, but they only take root in minds well prepared to receive them.
The task is not so much to see what no one has yet seen, but to think what nobody yet has thought about what everybody sees.
If you think you can, you can. If you think you can't, you're right.
If you go in for argument, take care of your temper. Your logic, if you have any, will take care of itself.
He who gambles picks his own pocket.
Obstacles are what a person sees when he takes his eyes off his goal.
The only thing worse than losing is quitting.