You can do anything you think you can. This knowledge is literally the gift of the gods, for through it you can solve every human problem. It should make of you an incurable optimist. It is the open door.
Robert CollierIn every adversity there lies the seed of an equivalent advantage. In every defeat is a lesson showing you how to win the victory next time.
Robert CollierWe can do only what we think we can do. We can be only what we think we can be. We can have only what we think we can have. What we do, what we are, what we have, all depend upon what we think.
Robert Collier