A hero is no braver than an ordinary man, but he is braver five minutes longer.

Nothing is impossible if you want it badly enough. Impossible = I'm possible.

I have not failed, I've just found 10,000 ways that won't work.

If you really want something you’ll find a way. If you don’t you’ll find an excuse.

It is never too late to turn an unproductive day into a productive one.

There are no shortcuts to any place worth going.

Never underestimate the importance of small steps. small steps = big changes. 

Mathematics Is not a spectator sport. The only way to learn mathematics is to do mathematics.

I think, therefore I am.

I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.

Good mathematics is not about how many answers you know... It is about how you behave when you don't know.

Don't be afraid to take an unfamiliar path.  Sometimes they're the ones that lead you to the best places.

Don’t compare yourself to others. Compare yourself to the person you were yesterday.

Run in the morning before your body figures out what you're doing

Success is not final and failure is not fatal. It is the courage to continue that counts.