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

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

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. 

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

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.

Twenty years from now you will be more disappointed by the things you didn’t do than the things you did do

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

Everything you want is on the other side of fear

Procrastination is the thief of time and the enemy of success.

Fall down seven times, stand up eight.

Don’t hang your targets after you’re done shooting.

Time is your friend, impulse is your enemy.

No matter how bad it gets, you’re still way ahead of those who haven’t even started.

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