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

There is no talent here. There is hard work and obsession. You could be anyone if you put in the time.

The easiest person to deceive is yourself.

Patience is when you’re supposed to get mad, but you choose to understand

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

Tough times never last, but tough people do.

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

There are no bad mistakes in maths, only discoveries.

The journey of a thousand miles begins with one step. 

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

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

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.

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

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

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.