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

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

I think, therefore I am.

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

The journey of a thousand miles begins with one step. 

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.

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.

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

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

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

You can pick up a mistake and carry it as a burden,  or you can set it down as use it as a stepping stone to greatness.

Skills are built not born.

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

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

Nobody said it’d be easy, they just promised it would be worth it.