I think, therefore I am.

Hard work always pays off - it is not a question of if you will get there, but WHEN you will get there

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

Hard work - a two way street where you get exactly what you put in.

Time is your friend, impulse is your enemy.

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

It is never too late to become what you might have been

Yesterday is history, tomorrow is a mystery, but today is a gift—that's why it's called 'the present

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

There is no talent here. There is hard work and obsession. You could be anyone if you put in the time.

Failure is NOT your destiny. Failure is the key to success.

Don't expect to be good at maths or understand things straight away. Be patient and persistent. Rome wasn't built in a day, but they worked on it every single day. 

If you can understand just one thing thoroughly, then you will understand everything.

The bad news is time flies, the good new is that you're the pilot.

Don't be afraid to take an unfamiliar path.  Sometimes they're the ones that lead you to the best places.