The evil urge is similar to a prankster running through a crowd showing his tightly closed hand. No one knows what it is he is holding. He goes up to each person and asks, "What do you suppose I have in my hand?" Each person imagines that the closed hand has in it just what he desires most. They all hurry and run after the prankster. Then, when he has tricked them enough, that they are following him, he opens his hand. It is completely empty! The same is true of the evil one. He tricks the world, fooling them into following him. Everyone thinks that his hand contains what they need. In the end, the evil one opens his hand. There is nothing in it and no desire is ever fulfilled. Worldly pleasures are just like sunbeams in a dark room. They may actually seem solid, but when a person tries to grasp a sunbeam they find nothing in their hand. The same is true of all worldly desires.