"The light of Death is the Dharmakaya, itself; one should understand this point and thus identify it. In order to recognize it, the 'Pointing-Out-on-Mind-Essence' practice should be given by one's guru. Thus one will understand the view of reality and the practice of the expressive Light of the Path."
These were his words:
The Light of Death is the primordial Mother-Light. In order to merge the Son-Light with the Mother-Light, one should practice in the waking state the gathering of the pranas into the Central Channel and the entering, remaining, and dissolving exercises. One should also contemplate the Four Emptinesses, especially the "All Emptiness" (or the Fourth Emptiness). Only if a yogi is able to merge with the Light, even in the deep-sleeping state, will he be able to merge the Son-Light with the Mother-Light through his prana power at time of death.
If he can recognize the Light of Death and merge with it, he will be able to recognize the subsequent emergence of Bardo. The recognition of the Light of Death and the capability of merging with it, is the only right way of "holding" the Bardo; there is no other way to hold or recognize Bardo. If he exercises during his lifetime on the practice of pretending to go through the successive stages by reminding himself "Now, death has come... This is the such and such vision of Bardo...," he may to some extent hold or recognize the Bardo, but his power to do so will be extremely weak.
Likewise, if he keeps exercising on the practice of imitating the successive stages of death, he may at the time of the emergence of the Light of Death, be absorbed in (his) Samadhi for a long period. Nevertheless, because of his
[paragraph continues] Samsaric Prana (literally, prana of this life) that never enables him to identify the Light of Death, it is very difficult to consider this kind of practice a practice of the unique Anuttara Tantra.
If he puts too much emphasis on this practice, it is like abandoning the basic teaching to put stress on the secondary teaching. Instead, he should practice the Heat Yoga and work hard on the gathering of pranas into the Central Channel. In his waking state, he should practice the entering, remaining, and dissolving process and the arising of the Four Emptinesses; if he is able to do so, he will be able to hold the Light of Sleep through his prana power.
If the yogi can raise the Illusory Body after the emergence the Light of Waking State and the Light of Sleep, only then will he be able to hold or recognize the Light of Death and Bardo. Then he will have attained a supreme and unprecedented confidence.