Those who saw the person and knew Him recognized Him in whatever form or guise; those who could only see the coat went astray. To the Sufi therefore there is only one Teacher, however differently He may be named at different periods of history, and He comes constantly to awaken humanity from the slumber of this life of illusion, and to guide man onwards towards divine perfection. As the Sufi progresses in this view he recognizes his Master, not only in the holy ones, but in the wise, in the foolish, in the saint and in the sinner, and has never allowed the Master who is One alone, and the only One who can be and who ever will be, to disappear from his sight.