There are no bad mistakes in maths, only discoveries.

Time is your friend, impulse is your enemy.

It is never too late to turn an unproductive day into a productive one.

We learn more from failure than we do from success.

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. 

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

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

Work on your weaknesses until they are your strengths and work on your strengths until they are second nature.

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

Hard work beats talent when talent doesn't work hard.

There are no shortcuts to any place worth going.

Don't be afraid to take an unfamiliar path.  Sometimes they're the ones that lead you to the best places.

Failure to prepare = preparing to fail

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

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