The monastic institutions of India seem due to Buddhism. There were wandering monks before the Buddha's time, but the practice of founding establishments where they could reside permanently, originated in his order. There appears to be no record of Hindu (as opposed to Buddhist) monasteries before the time of Śaṅkara in the ninth century, though there must have been places where the learned congregated or where wandering ascetics could lodge. Śaṅkara perceived the advantage of the cenobitic life for organizing religion and founded a number of maṭhs or colleges. Subsequent religious leaders imitated him. At the present day these institutions are common, yet it is clear that the wandering spirit is strong in Hindus and that they do not take to monastic discipline and fixed residence as readily as Tibetans and Burmese. A maṭh is not so much a convent as the abode of a teacher. His pupils frequent it and may become semi-resident: aged pilgrims may make it their last home, but the inmates are not a permanent body following a fixed rule like the monks of a Vihâra. The Sattras of Assam, however, are true monasteries (though even there vows and monastic costume are unknown) and so are the establishments of the Swâminârâyaṇa sect at Ahmedabad and Wartâl. 3 The vast and complicated organization of caste is mainly a post-Vedic growth and in the Buddha's time was only in the making.[417] His order was open to all classes alike, but this does not imply that he was adverse to caste, so far as it then prevailed, or denied that men are divided into categories determined by their deeds in other births. But on the whole the influence of Buddhism was unfavourable to caste, especially to the pretensions of the Brahmans, and an extant polemic against caste is ascribed (though doubtfully) to Aśvaghosha.[418] On the other hand, though caste is in its origin the expression of a social rather than of a religious tendency, the whole institution and mechanism have long been supported and exploited by the Brahmans. Few of them would dispute the proposition that a man cannot be a Hindu unless he belongs to a caste. The reason of this support is undisguised, namely, that they are the first and chief caste. They make their own position a matter of religion and claim the power of purifying and rehabilitating those who have lost caste but they do not usually interfere with the rules of other castes or excommunicate those who break them.[419] That is the business of the Pancayat or caste council.