So it is in the mind. When the heart is not sympathetic there is something missing in the mentality of man, and it is sympathy which opens it. The Sufis know the medicine for this disease, and it is the practice of the art which is called Zikr or Mantram. By practicing that particular art in the right way one activates these fine centers by vibrations. By the repetition of certain mystic words the centers begin to vibrate. Very often after only a short time of doing these practices a person feels quite different, especially when a mental thought is held during that time; thus concentration is developed at the same time. It helps the love-nature or sympathetic nature to be deepened or centralized, and as it begins to flow out an atmosphere is created, a spiritual atmosphere; this all comes from the development of feeling.