He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.

I'm convinced that about half of what separates successful entrepreneurs from the non-successful ones is pure perseverance.

I can calculate the motion of heavenly bodies, but not the madness of people.

If I had asked people what they wanted, they would have said 'faster horses'.

Your potential is boundless; embrace the challenges, push beyond your limits, and let your light shine brightly.

The worst bankrupt in the world is the person who has lost his enthusiasm.

A person will sometimes devote all his life to the development of one part of his body - the wishbone.