When the Bodhi-Hearth begins to melt and drop down from the upper center to the lower centers, if the Bodhi-Heart cannot remain at each center for a longer period, it will be extremely difficult for the yogi to recognize the differences between the Four Blisses. Especially will it be difficult to recognize the Innate Bliss. Thus one should know that if the mind can concentrate a long period on the four Chakras, the melted Bodhi-Heart will also remain at the different centers for a longer period. This is a very important point. If the Ham word at the Head Center that is the center of the white Bodhi-Heart can be stabilized, the white element will be greatly enhanced and multiplied. If the word at the Throat Center, the place through which

the Right Channel multiplies the blood-element, can be stabilized, the secretion of the Dumo which comes from the Navel Center will produce great power. [**] Consequently, it will promote and improve the practice of Dream Yoga. The Heart Center is the center of light. If the Hum word at the heart center is stabilized the great light will unfold. Meditation on the Heart Center will help the emergence of the light in both the waking and the sleeping states.

The small Ah word should also be stabilized at the Navel Center, since through it the Left Channel multiplies the fluid. From the Navel Center the White-Bodhi-Heart revitalizes the whole body. Furthermore, this center is the special place where the Dumo resides. It is well known that the Navel Center is the place where the fire, that melts the Bodhi-Heart, is kindled. [***]

It is of great importance that the yogi should acquaint himself with the teaching of the meditation on the Chakras and their words. Until all the words in the different Chakras appear vividly in the mind, the yogi should continue his effort.

The Practice of Vase-Breathing

Following the preceding instructions, the yogi should first clearly visualize the nerve [nadi = Tib. rtsa. Ed.] system in general, then concentrate on the center of the Central Channel at the cross section of the three channels. Next, the yogi should meditate on the four words in the different nerves; especially should he concentrate on the small Ah word in the Central Channel at the Navel Center. If this mind-holding object can be stabilized, the mind and prana will converge to it. Thus the mind reaches the state of concentration and the pranas are collected. This is stated in the Tantra of Bde-Mchog and the Expounding Tantra Sambhodra of Hevajra.