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.

Time is your friend, impulse is your enemy.

Dreams don't work unless you do.

No one starts out on top. You have to work your way up.

The master has failed more times than the beginner has even tried

I had no time is no excuse. 1 hour is 4% of your day and 1 minute is 0.34 % of your day.

There are no shortcuts to any place worth going.

A hero is no braver than an ordinary man, but he is braver five minutes longer.

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

The greatest glory in loving lies not in never falling, but in rising every time we fall.

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

Good mathematics is not about how many answers you know... It is about how you behave when you don't know.

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

I think, therefore I am.