The greatest enemy to human potential is your comfort zone

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

Everything you want is on the other side of fear

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

Time is your friend, impulse is your enemy.

Fall down seven times, stand up eight.

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

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

You cannot escape the responsibility of tomorrow by evading it today

The journey of a thousand miles begins with one step. 

We learn more from failure than we do from success.

We all make mistakes. What matters is how we choose to move forwards from them.

There are no shortcuts to any place worth going.

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

Tough times never last, but tough people do.