Instead of finding reasons why you can't, find reasons why you can.

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

Whenever you find yourself doubting how far you can go, just remember how far you have come.

Your attitude is everything. Pick a good one.

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

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

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

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

I have not failed, I've just found 10,000 ways that won't work.

I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.

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

Time is your friend, impulse is your enemy.

It doesn’t matter where you start, it matters how you end

Mathematics Is not a spectator sport. The only way to learn mathematics is to do mathematics.

I think, therefore I am.