nature of which is the innate ecstasy. If one can do so, then from the drop comes the tongue of a tiny flame of the inner heat. One fixes the mind on it. Light from this flame rises up the central channel, where it melts the drop of white bodhimind substance abiding within the crown chakra. This drips down like nectar, filling the AH-stroke mantric syllable at the navel chakra. One meditates single-pointedly on the AH-stroke, until the signs of stability arise. When meditative stability has been achieved then the radiance of the light from the inner fire will illuminate the inside and outside of one's body, as well as one's dwelling place and so forth, rendering them as transparent as a piece of kyurura fruit held in the hand.This practice will cause the vital winds to enter the central channel. Tsongkhapa describes various signs that this has occurred, mainly that the breath flows smoothly and evenly through the nostrils, then it becomes increasingly subtle, and then it stops altogether. Tummo practice is also said to generate the four blisses. Tsongkhapa explains that the first bliss arises when the energy drop in the crown chakra is melted when the vital winds are brought to the crown by tummo. When the energies reach the throat, this is the second bliss ("supreme bliss"), when they reach the heart, the third bliss arises ("special bliss") and when they reach the navel, the fourth "innate bliss" arises. If one can hold the mind at the chakras for extended periods, one will gain the ability to control the movement of the energy drops. Then one can also bring the drop back up the central channel, experiencing the blisses again but starting from the navel chakra. One then continues to practice by moving the drop up and down the central channel, experiencing the four descending and the four rising blisses again and again. To meditate on innate wisdom, one lets the drop melt all the way down to the chakra at the secret place ("tip of the jewel"). Then one meditates on emptiness and rests in that ecstasy - emptiness meditation. Then one brings the drop back to the crown chakra, which meditates on "the sphere of ecstasy conjoined with emptiness." Tsongkhapa further states: "During the post-meditation periods one must consciously cultivate mindfulness of the experience of ecstasy and emptiness, and stamp all objects and events