This refers to the "six subtleties" which Sufis recognize: Nafs, Qalb, Sirr, Ruh, Khafi & Akhfa. These lataif (sing : latifa) designate various psychospiritual "organs" or, sometimes, faculties of sensory and suprasensory perception. In a rough assessment, they might appear to correlate with glands, organs, Chinese traditional or vedic chakras. In general, sufic development involves the awakening in a certain order these spiritual centres of perception that lie dormant in every person. Each centre is associated with a particular colour and general area of the body, as well as ofttimes with a particular prophet, and varies from Order to Order. The help of a guide is considered necessary to help activate these centers. The activation of all these "centers" is part of the inner methodology of the Sufi way or "Work". After undergoing this process, the dervish is said to reach a certain type of "completion" or becomes a Complete Man.