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

Do what you have always done and you will always be what you have always been

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

He who has begun his task is half-way done. Have the courage to begin!

I think, therefore I am.

It doesn’t matter where you start, it matters how you end

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

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

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

Everything that happens was once a dream.

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

Skills are built not born.

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

Nothing is impossible if you want it badly enough. Impossible = I'm possible.

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