What a wonderful blessing the eyes of man are. When he closes them, he can see nothing. His whole world is clothed in darkness. There is a world out there which he cannot see; objects that he cannot perceive.
Then, when he opens his eyes, an astonishing spectacle opens out before him. Black can be distinguished from white. What moves appears to be moving, and what stands still is motionless in his sight. Animate and inanimate appear for what they are.
It is in this quality–the ability to distinguish between things–that man is unique. He is able to tell between right and wrong, and between light and darkness. He can see truth and falsehood for what they are. He is able to differentiate between what is proved by sound reason, and that which has no sound rational basis.
Truth appears before man in this world but he fails to see it. Its calls echo in his ears, but he is unable to hear it. It knocks on his door but he does not take it in.