"But this also must be said: he who does what he sees shall see more; he who fails to do what he sees goes blind. Nothing in the universe is more inexorable than this. If he sees, and does what he sees, every day the way he must go shall become more clear to him. But he who does not give himself to his ideal becomes calloused. It is not only that his eye may grow dull— his whole optic nerve dies. It is like a plant standing in the window and yet so calloused that it cannot tell the difference between light and dark."