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

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

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

Skills are built not born.

Be strong enough to stand alone, smart enough to know when you need help, and brave enough to ask for it.

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

Hope might be a good breakfast, but it makes a very poor dinner

Your attitude is everything. Pick a good one.

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

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

There are no bad mistakes in maths, only discoveries.

Time is your friend, impulse is your enemy.

Don’t practice until you get it right, practice until you can’t get it wrong.

It is never too late to turn an unproductive day into a productive one.

I think, therefore I am.