improve one's practice. There is a general sense in which any Tibetan Buddhist teacher is called a lama. A student may have taken teachings from many authorities and revere them all as lamas in this general sense. However, he will typically have one held in special esteem as his own root guru and is encouraged to view the other teachers who are less dear to him, however more exalted their status, as embodied in and subsumed by the root guru. One particular feature of the Tantric view of teacher student relationship is that in Tibetan Buddhist Tantra, one is instructed to regard one's guru as an awakened Buddha. Esotericism and vows In Vajrayāna particularly, Tibetan Buddhists subscribe to a voluntary code of self-censorship, whereby the uninitiated do not seek and are not provided with information about it. This self-censorship may be applied more or less strictly depending on circumstances such as the material involved. A depiction of a mandala may be less public than that of a deity. That of a higher tantric deity may be less public than that of a lower. The degree to which information on Vajrayāna is now public in western languages is controversial among Tibetan Buddhists. Buddhism has always had a taste for esotericism since its earliest period in India. Tibetans today maintain greater or lesser degrees of confidentiality also with information on the vinaya and emptiness specifically. In Buddhist teachings generally, too, there is caution about revealing information to people who may be unready for it. Practicing tantra also includes the maintaining of a separate set of vows, which are called Samaya (dam tshig). There are various lists of these and they may differ depending on the practice and one's lineage or individual guru. Upholding these vows is said to be essential for tantric practice and breaking them is said to cause great harm. Ritual There has been a "close association" between the religious and the secular, the spiritual and the temporal in Tibet. The term for this relationship is chos srid zung 'brel. Traditionally Tibetan lamas have tended to the lay populace by helping them with issues such as protection and prosperity. Common traditions have been the various rites and rituals for mundane ends, such as purifying one's karma, avoiding harm from demonic forces and enemies, and promoting a successful harvest. Divination and exorcism are examples of practices a lama might use for