The Bardo Thodol is a terma — a "treasure text" hidden by the great 8th-century Indian master Padmasambhava (Guru Rinpoche) and rediscovered in the 14th century by the Tibetan terton (treasure-revealer) Karma Lingpa. According to Tibetan Buddhist tradition, Padmasambhava hid certain teachings in rocks, lakes and the minds of his disciples, to be revealed when humanity was ready for them. The Bardo Thodol was among these — discovered on a mountain in central Tibet and transmitted through the Nyingma lineage.
The text belongs to the Vajrayana (tantric) Buddhist tradition and presupposes familiarity with its cosmology. Its central premise is that death is not the end of consciousness but a transition — and that the 49-day period following physical death (the bardo — "intermediate state" in Tibetan) offers multiple opportunities for liberation from the cycle of rebirth. These opportunities are missed by most people — not because liberation is impossible but because the unprepared consciousness, confused by the shock of death and the intensity of the visions it encounters, fails to recognise them for what they are.
The text therefore serves two purposes simultaneously. For the dying: to prepare them for what they will experience, so that when they encounter the Clear Light of the Dharmata or the peaceful and wrathful deities of the bardo, they can recognise these as manifestations of their own mind rather than external realities — and in recognising them, achieve liberation. For the living: to understand the nature of mind and the process of death-and-rebirth while still alive, using that understanding as a basis for meditation practice that prepares one for the bardo.
The text is traditionally divided into three main sections corresponding to the three bardos — the moment of death, the subsequent vision-filled intermediate state and the final stage of choosing rebirth. A lama (teacher) sits with the dying person and reads the text aloud, guiding their consciousness through each stage as it occurs.