Examining the understanding of heat in Vajrayana gives insight into tantra’s somewhat different embrace of classical Buddhist imagery. From this perspective, the experience of mental burning is indeed the central suffering of our lives. It is the experiential dimension of the intensity of our obscurations, whether emotional, conceptual, or habitual. But rather than attempting to put out the flames with meditation methods, it is important to allow the burning to occur during practice. Certainly in the foundational stages of the path we must learn not to become engulfed in the flames, to tame the wild mind and emotions, and to train ourselves to open further to experience. Finally, however, through Vajrayana practice under the guidance of a guru, the burning we experience becomes a great teacher and a great blessing.
From Dakini’s Warm Breath: The Feminine Principle in Tibetan Buddhism by Judith Simmer-Brown, page 135