Before & after the SD 1:58-9 quote is this:Is such absolute unity possible in nature? In the material world? Or is it the absolute antithesis of nature -- a spiritual perfection?
The first and Fundamental dogma of
Occultism is Universal Unity (or Homogeneity) under three aspects.
This led to a possible conception of Deity, which as an absolute unity
must remain forever incomprehensible to finite intellects. “ If thou
wouldest believe in the Power which acts within the root of a plant, or
imagine the root concealed under the soil, thou hast to think of its stalk
or trunk and of its leaves and flowers. Thou canst not imagine that
Power independently of these objects. Life can be known only by the
Tree of Life. . . .” (Precepts for Yoga).
[This passage follows]:
Say the Kabalists : “ The Deity is one,
because It is infinite. It is triple, because it is ever manifesting.”
This manifestation is triple in its aspects, for it requires, as Aristotle has
it, three principles for every natural body to become objective : privation,
form, and matter. Privation meant in the mind of the great
philosopher that which the Occultists call the prototypes impressed in
the Astral Light — the lowest plane and world of Anima Mundi. The
union of these three principles depends upon a fourth — the life which
radiates from the summits of the Unreachable, to become an
universally diffused Essence on the manifested planes of Existence.