There are many who desire mystical knowledge so that they may become healers, so that they may heal themselves and their friends without presenting a doctor's bill, and may be cured without the help of a physician. These things may come to a Sufi on his path towards a higher aim. He may encounter them all upon his journey, but to remain among them would be just as if one intended to go to the station to meet a friend, but stopped on the way to talk to other acquaintances and so arrived at the station too late.