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

There are no shortcuts to any place worth going.

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

Skills are built not born.

I think, therefore I am.

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

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

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.

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

If you can understand just one thing thoroughly, then you will understand everything.

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

Each day is an opportunity to improve. Aim to be that little bit better than yesterday and better tomorrow than today.

The journey of a thousand miles begins with one step. 

We learn more from failure than we do from success.

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