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

Work on your weaknesses until they are your strengths and work on your strengths until they are second nature.

Whenever you find yourself doubting how far you can go, just remember how far you have come.

The temptation to quit will be the greatest when you are about to succeed

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

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

Everything you want is on the other side of fear

Hard work beats talent when talent doesn't work hard.

Don't put off until tomorrow what you can do today. If today you have no time, it means tomorrow you'll be too tired and the next day you'll be something else.

Tough times never last, but tough people do.

There is no elevator to success, you have to take the stairs.

Dreams don't work unless you do.

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

You can hire a tutor but you can't hire someone to practice for you.

Just stick with it, what seems hard now will one day be your warm up.