99% of failures come from people who have the habit of making excuses.

Time is your friend, impulse is your enemy.

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 practice until you get it right, practice until you can’t get it wrong.

Skills are built not born.

You're not in competition with anyone but yourself. Outdo your past, not other people.

Instead of finding reasons why you can't, find reasons why you can.

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

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

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

Tough times never last, but tough people do.

Everything you want is on the other side of fear

A book a day keeps the stupidity away.

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

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