Природа Будды (в чём польза и смысл такого понимания)

O noble youth, take for instance a skilful jewel-maker who knows
quite well how to purify precious stones. Having taken out an
unpurified precious stone from the mine, and having washed it
with acid salt water, he then polishes it by rubbing with black-
hair cloth. But with this much work, he never ceases to make
efforts. After that, having washed the stone with meat juice
of bitter taste, he polishes it by rubbing with a woollen blanket.
Even with this much work, he never ceases to make efforts. After
that, having washed it with great medical liquid, he polishes it
with closely-woven cotton cloth After having been polished and
having been separated from all impure metals mingled with it,
it is called a precious  Vaidūrya stone. Similarly, 0 noble youth,
the Tathāgata too, having known the unpurified element of living
beings, creates disgust in the mind of those living beings who
are attached to the world of transmigration through the teaching
of being afraid of the non-eternity, suffering, impersonality and
impurity [of this world], and causes them to enter the discipline
of the sacred Doctrine. With this much of act the Buddha never
ceases to make efforts. After that, he makes them realize the
guiding manner  of the Tathāgata by the teaching of [the threefold
gate to the emancipation , viz.] ' non-substantiality ' {śūnyatā),
' non-distinction ' (animitta) and ' desirelessness ' (apranihita).
Even with this much of act, the Tathāgata never ceases to
make efforts. After that, through the teaching of the irreversible
wheel of the Doctrine  and through the teaching of the ' purification
of three circles , he causes those living beings who have
different kinds of characteristics and origins, to enter the sphere
of the Tathāgata. Having entered [the sphere of the Tathāgata],
those same beings, when they have realized the true nature of
the Tathāgata, are called unparalleled venerables.