As man is ideal among the lower and higher creatures among the visible as well as the invisible beings, his life is among all beings of the universe a great privilege to experience. Man goes in life through two periods, that of light and that of darkness. During the period of darkness he ceases to think wherefrom he has come and where he goes to, and why he is sent here to wander for a while, whether he is sent by someone, or whether he came of his own will, and whether he will be here forever, or if some day his life will be extinguished.