Buddhist-Meditation-Systematic-and-Practical

clarification we should make some comparisons.
2. Method
In the highest yoga there are the practices of the wisdom
(prajna) energy, the wisdom channel and the wisdom
essence, but in the lower Tantras derived from the two
great sutras (see Appendix I, Part Two, B, 4) the theory
is written but the method unknown.
3. The Elements
Yogatantra does have the theory of the six elements, but
the five material ones are not used as they are in
anuttarayoga, where the five are taken in from the
surroundings and converted into wisdom. This is a
Buddha's breathing.
4. Heavenly Union
In the Japanese Tantra, the male and female figures in
union (Tibetan: yab-yum; Sanskrit: yuganaddha), are
not known. They do have a few deities who embrace,
but only in heavenly fashion (without contact of the
reproductive organs) and with meditation bodies. In
their case, while the bodies are higher (dhyana-bodies),
the function is lower (not involving all the elements).
Anuttarayoga includes practices with the body of flesh
and many deities are shown in a symbolic sexual union.
451