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. 

Procrastination makes easy things hard and hard things harder.

Shoot for the moon and even if you miss you’ll land among the stars/

It always seems impossible until it's done.

Patience is when you’re supposed to get mad, but you choose to understand

The bad news is time flies, the good new is that you're the pilot.

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

You can have results or excuses, not both

Run in the morning before your body figures out what you're doing

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.

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

The boxer is not afraid of being knocked down, he is afraid of not being able to get up again.

Don’t practice until you get it right, practice until you can’t get it wrong.

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

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.