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

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

Skills are built not born.

You can be shown the path, but only you can make the first step.

The journey of a thousand miles begins with one step. 

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

The journey of a thousand miles begins with one step.

It is never too late to become what you might have been

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

No matter how bad it gets, you’re still way ahead of those who haven’t even started.

Work ethic is important, because, unlike intelligence, athleticism, or charisma, or any natural attribute, it’s a choice.

It always seems impossible until it's done.

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

Success is not final and failure is not fatal. It is the courage to continue that counts.

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