Instead of finding reasons why you can't, find reasons why you can.

Success is a journey, not a destination.

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

The journey of a thousand miles begins with one step.

Dreams don't work unless you do.

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

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

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

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

Be strong enough to stand alone, smart enough to know when you need help, and brave enough to ask for it.

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

The easiest person to deceive is yourself.

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

It always seems impossible until it's done.

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