Ambition is the greatest asset of being young, delusional ambition: A feeling that you're going to conquer the world at one point...

People often define old age with weakness, but to me old age is the loss of ambition... I remember reading a sales a book a while ago, in which the author laid out the greatest quote I ever read:

"Ambition is the spur that makes men struggle with destiny. It is heaven’s own incentive to make purpose great and achievement greater."