_In this manner we can operate on the principle of unity, even in a world where appearances have multiplicity. But how exactly can we say that all things are one? It is not something that can be fully understood with the rational mind, and initially it must be taken partly on faith, as a holding action until we can understand it intuitively. His translator John Blofeld uses the traditional Buddhist analogy of the sea, which is both constantly changing and yet eternally changeless: "Contemplation of the movement and shifting composition of sea-waves is a useful symbolical approach; for, not only are the waves and the sea identical in substance, but also a given wave does not preserve its individual identity for a single moment as the water composing it is never for an instant entirely the same; thus, by the time it reaches us from a distance, every drop it contains will be other than the drops composing it when we saw it first. On the other hand, sea-water is sea-water and the wave is entirely composed of that. Each wave is void--a mere fluctuating appearance identical in substance with every other wave and with the entire ocean. . . ."15 Waves are a perfect metaphor for the idea of everything and nothing at once, since they are both ephemeral and part of a larger reality, the sea, out of which they emerge, assume a physical appearance, and then dissolve. They seem to exist, yet you cannot grasp and hold them. They are both existing and nonexistent. Thus they resemble the Void, a kind of energy that manifests itself through diverse illusory objects of the senses, but which is itself ungraspable, changeless unity. With this in mind, perhaps it is easier to understand Huai-hai when he declares: _The nature of the Absolute is void and yet not void. How so? The marvellous "substance" of the Absolute, having neither form nor shape, is therefore undiscoverable; hence it is void. Nevertheless, that immaterial, formless "substance" contains functions as numerous as the sands of the Ganges, functions which respond unfailingly to circumstances, so it is also described as not void.16 _ By focusing on this idea of unity in an Absolute, we also interact with our own perception of time. Since it is important that the mind not dwell on anything, naturally enough this applies to time as well as space.