It acknowledged that there were two paths to enlightenment (complete transcendence of identification with the personal ego). One path was that taught in the sutras according to the historical teachings. The heart of sutra practice was based on morality, concentration, and wisdom (not identifying with the personal ego). The other path, which has become the cornerstone of Tibetan variations, was tantric. This practice blended the sutra teachings with techniques adapted from Hindu systems of yoga and tantra.
Tantric systems transform the basic human passions of desire and aversion for the purpose of spiritual development. Rather than denying such primal urges, tantra purifies them into wholesome and helpful forces. It is very much like trying to deal with a wild horse charging towards you. One way is denial: put up your hands and shout out, "stop, stop!" Probably you will be bowled over by the animal.
Another, more clever, approach is to step aside and then jump on its back as it charges past you. In such a case, you have a chance to start coaxing it to move in certain directions, and over time you may be able to direct it into a stable. Truthfully, one needs some skill in both self-control and acceptance if one is to be successful with tantric work.
The most dedicated Tibetan Buddhists seek nirvana, but for the common people the religion retains shamanistic elements. The worship also includes reciting prayers and intoning hymns, often to the sound of great horns and drums. A protective formula of esoteric significance, Om mani padme hum [Om, the jewel in the lotus], is repeated endlessly; it is inscribed on rocks and walls, tallied on prayer wheels, and displayed on banners and streamers.
In addition to a large pantheon of spirits, ghouls, and genii, many Buddhas and bodhisattvas (future Buddhas) are worshiped along with their ferocious consorts, or Taras. The monastic orders include abbots, ordained religious mendicants, novices (candidates), and neophytes (children on probation). The standing of nuns is inferior.