There is no elevator to success, you have to take the stairs.

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

We learn more from failure than we do from success.

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

I think, therefore I am.

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.

It always seems impossible until it's done.

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

Yesterday is history, tomorrow is a mystery, but today is a gift—that's why it's called 'the present

If you can understand just one thing thoroughly, then you will understand everything.

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

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

Don’t hang your targets after you’re done shooting.

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

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