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

Time is your friend, impulse is your enemy.

I think, therefore I am.

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

I can is 100 times more important than IQ.

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

Lose an hour in the morning and you will spend all day looking for it.

Start, struggle, fail, fix and learn. Repeat.

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

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

Your limitation - its only your imagination.

It always seems impossible until it's done.

Shoot for the moon and even if you miss you’ll land among the stars/

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

Success is the sum of small repeated efforts, day in and day out.