Ordinarily there are four chief divisions or castes (varna) of Hindu society, viz.: Brahmana (priesthood; teaching); Kshattriya (warrior); Vaishya (merchant); Shudra (servile), said to have sprung respectively from the mouth, arm, thigh, and foot of Brahma. A man of the first three classes becomes an investiture, during the upanayana ceremony of the sacred thread, twice-born (dvija). It is said that by birth one is shudra, by sangskara (upanayana), dvija (twice-born); by study of the Vedas one attains the state of a vipra; and that he who has knowledge of the Brahman is a Brahmana. The present Tantra, however, speaks of a fifth or hybrid class (samanya), resulting from intermixture between the others. It is a peculiarity of Tantra that its worship is largely free of Vaidik exclusiveness, whether based on caste, sex, or otherwise. As the Gautamiya Tantra says, "The Tantra is for all men, of whatever caste, and for all women" (Sarvvavarnadhikaraschcha narinang yogya eva cha).