Tough times never last, but tough people do.

Everything you want is on the other side of fear

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

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

No one starts out on top. You have to work your way up.

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

I have not failed, I've just found 10,000 ways that won't work.

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

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

I think, therefore I am.

The road to success is like a staircase. If you want to succeed, double your failure rate

Don't fear failure, fear being in the same exact same place next year as you are now.

Failure is not the opposite of success, it is part of the success.

There is no talent here. There is hard work and obsession. You could be anyone if you put in the time.

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