I think, therefore I am.

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

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

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

You can have results or excuses, not both

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

Mistakes have the power to turn you into something better than you were before.

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.

Failure is not the opposite of success, it is part of the success.

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

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

Your attitude is everything. Pick a good one.

Failure to prepare = preparing to fail

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