Ghazali, a great Sufi writer of Persia, has said that entering the spiritual path is just like shooting an arrow at a point one cannot see, so that one does not know what the arrow is going to hit; one only knows one's own action, and one does not see the point aimed at. This is why the path of initiation is difficult for a worldly man. Human nature is such that a man born into this world, who has become acquainted with the life of names and forms, wants to know everything by name and form; he wants to touch something in order to be sure that it exists. It must make an appeal to his physical senses before he thinks that it exists; without this he does not believe that anything can exist. Therefore it is difficult for him to undergo an initiation on a path which does not touch any of his senses. He does not know where he is going.