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. 

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

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

Everything that happens was once a dream.

You're not in competition with anyone but yourself. Outdo your past, not other people.

He who has begun his task is half-way done. Have the courage to begin!

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

Don’t compare yourself to others. Compare yourself to the person you were yesterday.

You can pick up a mistake and carry it as a burden,  or you can set it down as use it as a stepping stone to greatness.

Start, struggle, fail, fix and learn. Repeat.

The journey of a thousand miles begins with one step.

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

When you make a mistake, take another chance. Only when you choose not to do so do you fail.

Fall down seven times, stand up eight.

If you want to succeed, double your failure rate.