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.

Failure to prepare = preparing to fail

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. 

You cannot escape the responsibility of tomorrow by evading it today

Hope might be a good breakfast, but it makes a very poor dinner

Dreams don't work unless you do.

You can have results or excuses, not both

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

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

The greatest enemy to human potential is your comfort zone

It always seems impossible until it's done.

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

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

There is great wisdom in being able to realise that you don’t understand something before it goes too far.

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