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.
Make every thought, every fact, that comes into your mind pay you a profit. Make it work and produce for you. Think of things not as they are but as they might be. Don't merely dream - but create!
One comes to believe whatever one repeats to oneself sufficiently often, whether the statement be true of false. It comes to be dominating thought in one's mind.
It is your work to clear away the mass of encumbering material of thoughts, so that you may bring into plain view the precious thing at the center of the mass.