A chemist may have all the medicines, but if every person went and got whatever medicine he wanted, he might cure himself or kill himself. Even more difficult and more responsible is the work of using the repetitions of certain psychological words or phrases. It is the physician's responsibility to give a certain person a proper medicine necessary for his condition, for his purpose. In the East one searches for a Guru, or a Murshid as the Sufis call him, who has the experience of psychological prescription, and one takes what the Murshid has prescribed as an instruction. First the Murshid makes a diagnosis of the person's condition, and according to that he prescribes a word or phrase by the repetition of which that person may arrive at the desired goal.