The boxer is not afraid of being knocked down, he is afraid of not being able to get up again.

It is never too late to become what you might have been

If you fail, next time fail better.

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

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

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

Tough times never last, but tough people do.

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

Failure is NOT your destiny. Failure is the key to success.

Work ethic is important, because, unlike intelligence, athleticism, or charisma, or any natural attribute, it’s a choice.

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

Don’t be afraid to work hard and find out how good you can really be.

It doesn’t matter where you start, it matters how you end

When you make a mistake, take another chance. Only when you choose not to do so do you fail.

It always seems impossible until it's done.