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. 

I think, therefore I am.

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

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

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

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

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

Fall down seven times, stand up eight.

Failure is not the opposite of success, it is part of the success.

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

Success can never happen without the journey (struggle).

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

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

I can is 100 times more important than IQ.

Everything that happens was once a dream.