Another feature of Hindu sects is the extravagant respect paid to Gurus or teachers. The sanctity of the Guru is an old conviction in India. By common consent he is entitled to absolute obedience and offences against him are heinous crimes. But in sectarian literature there appears a new claim, namely, that the Guru in some way is or represents the god whose worship he teaches. If the deity is thought of primarily as a saviour, the Guru is said to deliver from suffering and hell: if he requires surrender and sacrifice, then person and possessions must be dedicated to the Guru. Membership of a sect can be attained only by initiation at the hands of a Guru who can teach a special mantra or formula of which each sect has its own. In some of the more modern sects the Guru need not be a Brahman, but if he cannot be venerated for his caste, the deficiency is compensated by the respect which he receives as a repository of oral teaching. The scriptural basis of many sects is dubious and even when it exists, many of the devout (especially women) have not the inclination or ability to read and therefore take their religion from the lips of the Guru, who thus becomes an oracle and source of truth. In Bengal, the family Guru is a regular institution in respectable castes. In many sects the founder or other prominent saint is described as an incarnation and receives veneration after death.[435] This veneration or deification of the Guru is found in most sects and assumes as extreme a form among the Śaivas as among the Vaishṇavas. The Śaiva Siddhânta teaches that divine instruction can be received only from one who is both god and man, and that the true Guru is an incarnation of Śiva. Thus the works of Mâṇikka-Vâçagar and Umâpati speak of Śiva coming to his devotees in the form of the Guru. In the sects that worship Kṛishṇa the Gurus are frequently called Gosain (Goswami).[436] Sometimes they are members of a particular family, as among the Vallabhâcâryas. In other sects there is no hereditary principle and even a Sudra is eligible as Guru.