So it is in the mind; when the heart is not sympathetic something is missing in the mentality of man, and it is sympathy which opens it. Sufis have the medicine for this disease: it is the practice of a certain art which in our language is called zikr or mantram. By practicing that particular art in the right way one works with vibrations on these fine centers. It is a process of vibrations by the help of certain mystically prescribed words; by the repetition of these mystical words the centers begin to vibrate. Very often after six weeks' practice a person feels quite different. Then with that vibration a thought is held in the mind and so concentration is developed at the same time. It helps the love nature or sympathetic nature to be deepened and centralized in the person.