The boxer is not afraid of being knocked down, he is afraid of not being able to get up again.

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

I think, therefore I am.

The journey of a thousand miles begins with one step. 

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

There are no bad mistakes in maths, only discoveries.

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

Shoot for the moon and even if you miss you’ll land among the stars/

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

Go as far as you can see, when you get there, you’ll be able to see further

You can pick up a mistake and carry it as a burden,  or you can set it down as use it as a stepping stone to greatness.

Life is full of opportunities. With every opportunity that is missed, another one is born.

We learn more from failure than we do from success.

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

Don’t confuse your path with your destination. Just because its stormy now doesn’t mean you are headed for failure.