You can have results or excuses, not both

Whenever you find yourself doubting how far you can go, just remember how far you have come.

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

The wise person knows that no answer is also an answer

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

Success can never happen without the journey (struggle).

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

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

Pure mathematics is in its way, the poetry of logical ideas.

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

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

Procrastination is the thief of time and the enemy of success.

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

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.