It is a truth, that, as Edgar Allan Poe said, the eyes are the windows for the soul, the windows of that haunted palace in which it dwells. This is the very nearest interpretation into ordinary language of the meaning of the text. If grief, dismay, disappointment or pleasure, can shake the soul so that it loses its fixed hold on the calm spirit which inspires it, and the moisture of life breaks forth, drowning knowledge in sensation, then all is blurred, the windows are darkened, the light is useless. This is as literal a fact as that if a man, at the edge of a precipice, loses his nerve through some sudden emotion he will certainly fall. The poise of the body, the balance, must be preserved, not only in dangerous places, but even on the level ground, and with all the assistance Nature gives us by the law of gravitation. So it is with the soul, it is the link between the outer body and the starry spirit beyond; the divine spark dwells in the still place where no convulsion of Nature can shake the air; this is so always. But the soul may lose its hold on that, its knowledge of it, even though these two are part of one whole; and it is by emotion, by sensation, that this hold is loosed. To suffer either pleasure or pain, causes a vivid vibration which is, to the consciousness of man, life. Now this sensibility does not lessen when the disciple enters upon his training; it increases. It is the first test of his strength; he must suffer, must enjoy or endure, more keenly than other men, while yet he has taken on him a duty which does not exist for other men, that of not allowing his suffering to shake him from his fixed purpose. He has, in fact, at the first step to take himself steadily in hand and put the bit into his own mouth; no one else can do it for him. The first four aphorisms of "Light on the Path," refer entirely to astral development. This development must be accomplished to a certain extent--that is to say it must be fully entered upon--before the remainder of the book is really intelligible except to the intellect; in fact, before it can be read as a practical, not a metaphysical treatise.