We all have two lives. The second begins when we realise we only have one. 

He who has begun his task is half-way done. Have the courage to begin!

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

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

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

Do Not Be Afraid To Make Mistakes. Each mistake teaches us something.

Success is a journey, not a destination.

If you want to succeed, double your failure rate.

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

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

Don't fear failure, fear being in the same exact same place next year as you are now.

A book a day keeps the stupidity away.

Fall down seven times, stand up eight.

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

There are no shortcuts to any place worth going.