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. 

Success is the sum of small repeated efforts, day in and day out.

Failure to prepare = preparing to fail

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

We all make mistakes. What matters is how we choose to move forwards from them.

The greatest mistake we make is living in constant fear that we will make one.

Fall down seven times, stand up eight.

Knowledge is of no value unless you put it into practice.

Tough times never last, but tough people do.

Just stick with it, what seems hard now will one day be your warm up.

You cannot escape the responsibility of tomorrow by evading it today

Never underestimate the importance of small steps. small steps = big changes. 

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

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

Try and do one thing each day that you would really rather not do.