In nearly every person's life you see it, and the greater the person the more you see this. Because the greater the person the more powerful his faith, and therefore he is able to see the value of faith. And at the same time it is just like sending a kite so far, and before it reached further it drops. And that enemy which causes this is doubt. As Orpheus went by the power of faith, Eurydice was drawn; his faith was drawing Eurydice. As he went forward in faith, so Eurydice was coming, following him. He could have gone to the other side of the world and Eurydice would have followed him. As much faith he had, so far Eurydice followed him. And there came doubt, the worst enemy of man, and said, "Look if she is really there." As soon as he turned back Mercury was there to lift her up and take her away.