is able to gather the pranas in the Central Channel in the daytime practice and practises the concentration of the Hum word at the Heart Center in the Central Channel before bedtime, the pranas will be gathered easily in the Central Channel. The experiences of the emergence of the Voidness are as follows: First, the yogi sees the water-reflection-like mirage, then it vanishes and becomes smoke. The yogi sees many sparkling lights like those of the glowworm, then they vanish again and become the stable light of a lamp. This light vanishes, and the yogi sees the manifestation as the lucid Thig-le like moonlight shining in the clear sky. The serene moonlight spreads over all the universe; this experience is called the "Voidness" or the "Emergence." Then the vision vanishes again, and the yogi experiences all his mental manifestations appearing to be a clear sky and sees the all-spreading glaring sunlight, its color not like the blazing fire-ball but sparkling and gleaming. This experience is called the "Extreme Emptiness" or the "Augmentation of Manifestation." Then the yogi experiences, as the sky extending over all the universe, his mental manifestations appearing to be the dark firmament at night, dark but not black. At this time, if the yogi concentrates on the upper part of the body, the vision will not disappear; if he concentrates on the lower part of the body, the mind will become dim and dull; however, this experience is not harmful. Keeping one's mind on the instruction, the yogi cultivates this experience of darkness and eventually a very stable "Light" will emerge. The emergence of this light is called the "Great Emptiness" or the "Manifestation of Attainment."

When the yogi arises from the darkness, a vision like the clear sky of dawn will emerge, which is neither exactly

like the color or shape of the sky, nor like the sunlight, moonlight, or darkness. This stage is called the "Universal Voidness." He should try to absorb himself in this great voidness as long as possible.

In the teaching of Gsun-adus of the Marpa School, one may find instructions for avoiding either the sudden awakening from sleep or the falling into dream state.

The Four Voidnesses are also called the Four Blisses. The Fourth Voidness is identified with the supreme Innate Bliss. The rapturous and non-thought aspects of this Innate Bliss are expediently called "bliss"; actually they are two characteristics among others of the Voidness which are seen as clearly (by the enlightened beings) as one sees his own palm.