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

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

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

A book a day keeps the stupidity away.

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

The wise person knows that no answer is also an answer

Your attitude is everything. Pick a good one.

You cannot start the next chapter of your life if you keep re-reading the last one.

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

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

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

If you fail, next time fail better.

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

You can have results or excuses, not both

Don’t compare yourself to others. Compare yourself to the person you were yesterday.