Work like you don't need the money, dance like nobody's watching and love like you've never been hurt. 

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

Pure mathematics is in its way, the poetry of logical ideas.

Don't put off until tomorrow what you can do today. If today you have no time, it means tomorrow you'll be too tired and the next day you'll be something else.

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

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

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

The road to success is like a staircase. If you want to succeed, double your failure rate

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

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

Do Not Be Afraid To Make Mistakes. Each mistake teaches us something.

Your attitude is everything. Pick a good one.

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

Nothing is impossible if you want it badly enough. Impossible = I'm possible.

Life is full of opportunities. With every opportunity that is missed, another one is born.