This article should shed some light:
http://www.jenchen.org.sg/vol9no3a.htm


Volume
9 Issue No. 3
The
myriad of things and phenomena in this world are formed by
aggregations of numerous causes and conditions comprising four
elements: earth, water, fire and wind. As such, they do not have
independent natures of their own. A tree, for example, is the
result of a combination of nutrients, water, sunlight and air.
Thus, they are in fact empty because when the conditions that
created and sustained them are no longer present, these objects
will return to emptiness. However, we don't see them in this light.
We think they are real, absolute and permanent. But they are not.
They are dependent upon other conditions. We need to truly
comprehend and awaken to this fundamental truth of
emptiness.
The
phrase 'all form is non-form' is from the Diamond Sūtra.
Buddha
said, "Subhūti, what do you think? Can we use our ordinary
flesh-eyes to see the Tathāgata’s physical form and thus believe we
are seeing the true Tathāgata ?"
Subhūti
replied, "No, World-honoured One. We cannot look upon the unreal
form of the Tathāgata’s manifestation and think we have perceived
the non-arising and non-ceasing true body of the
Tathāgata."
How
is that? The 16-foot physique of the Tathāgata is a bodily form
produced by an aggregation of causes and conditions. When life
ends, that body decays and eventually vanishes. It is not the truly
pure Dharma-kāya of the Tathāgata because the Dharma-kāya has no
form to be seen; it is empty and tranquil. How could flesh-eyes of
sentient beings see the true form of the Tathāgata’s
Dharma-kāya?
Buddha
told Subhūti, "Not only is the Tathāgata’s bodily form a false form
produced by the aggregation of causes and conditions, which does
not have real substance, so is any kind of thing in the universe,
in this world as well as beyond this world. All living and
non-living things, shapes and colours are merely formed by
aggregations of causes and conditions. They are impermanent and
will change as causes and conditions disperse. They are as illusory
as the flower in the mirror or the moon in the water!
"If
looking at appearances of objects, sentient beings are able to
lucidly awaken to its aggregation of causes and conditions, and
understand impermanence, their arising and ceasing; and if at that
very instant, distinguishing does not arise, then without
discrimination, they can enter into deep stillness. In stillness,
pure wisdom reveals itself. With supreme wisdom, they realise that
all worldly form is created by causes and conditions. Its nature is
empty; it is not reality. In this way, they will directly perceive
the Tathāgata’s Dharma-kāya."
Subhūti
was the Arahat who best understood emptiness. Thus, with regards to
emptiness, he had profound realisation. We see this in a
story:
Once,
Buddha went to the heavenly palace of Trayastrimśās to preach
Dharma to his mother. He only returned to earth after having been
gone for a few months. All of his disciples missed him. When he
returned, they rushed to welcome him, each hoping to be the first
to pay their respects to him. Being the most advanced in
supernatural ability amongst the Buddha's female disciples,
Bhiksunī Lián-huā-sè (蓮花色) used her supernatural powers and
transformed herself into the image of Saint-king Cakravartī. Then,
with great poise, she went to stand right up in front. She very
happily paid her respects toBuddha and said, "Disciple Lián-huā-sè
is the first to pay respects to Buddha today. Oh, I’m
overjoyed!"
Buddha
replied with a smile, "Lián-huā-sè, the first to see the Tathāgata
wasn’t you. It was Subhūti!"
Bhiksunī
Lián-huā-sè was astonished! Subhūti had not joined in the queue to
welcome the Buddha. How could he have been the first to meet the
Buddha?
Buddha
then said, "The bodily form of the Tathāgata is not seen by our
perceptions. He who sees the Dharma, sees the
Tathāgata."
As it
turned out, when Buddha returned to earth, Subhūti had been in the
meditation hall sitting in stillness, deeply observing the
emptiness of all things and phenomena, clearly understanding the
reality of inherent emptiness, and thus realising the formless
Dharma-kāya of Tathāgata. Even though he had not been there in the
queue, he had in fact truly seen the Tathāgata.
Buddha
has three bodies (Trikāya). One is 'Nirmāna-kāya'(化身), or the
'Emanation Body'. According to the sentient beings' capacity for
understanding, Buddha manifests the illusory forms of physical
bodies in numerous worlds. Because of their heavy karmic
hindrances, some disciples were only able to see the 16-foot golden
body of the Buddha, but were unable to see the 32 physical
characteristics and 80 accompanying physical features of a great
person (i.e. Dvātrimśadvara-laksana and Anuvyañjana).
Another
body of Buddha is 'Sambhoga-kāya' (报身), or the 'benefiting body',
of which are two kinds: one is the 'body which benefits oneself',
and the other is the 'body which benefits others'. The former is
the Buddha's own attainment and awakening to his meritorious
intrinsic pure Buddha-nature, in the state of Dharma joy. The
latter is the appearance of enlightened, liberated Bodhisattvas to
guide beginner-Bodhisattvas (i.e. sentient beings who emulate
Bodhisattvas and practise the Bodhisattva Way) according to
prevailing causalities, enabling these beginner-Bodhisattvas to
benefit from the teachings of Greater Vehicle (Mahāyāna) with
Dharma joy. Both Nirmāna-kāya and Sambhoga-kāya are physical forms
which are visible. However, the perfect Sambhoga-kāya of Great
Bodhisattvas is a form that is infinite and of awesome majesty. It
is not something that ordinary sentient beings like us can see.
What ordinary people see is the Nirmāna-kāya form.
The
third body of Buddha, named 'Dharma-kāya'(法身), is the Truth Body of
the Tathāgata, and also the reality of all phenomena. It permeates
all of space and is omnipresent. An ancient sage said, "Green
bamboos are entirely Dharma-kāya, luxuriant chrysanthemums are all
Prajñā; each grass, each tree, all in the ocean of Buddha-nature.
Green bamboos are used for expressing the state of Dharma-kāya, but
bamboos are by no means Dharma-kāya. Luxuriant chrysanthemums are
used for displaying the function of Prajñā, but chrysanthemums are
by no means Prajñā."
The
myriad of things and phenomena in this world are formed by
aggregations of numerous causes and conditions comprising four
elements and five skandhas , arising by causality and ceasing by
causality; their nature is inherently empty. And everything in the
world is as such. They do not exist as individual entities. Hence,
the nature of all things and phenomena is empty, tranquil and all
pervasive. However, people are unaware of this and are grasping on
to their belief that the numerous forms in the universe truly
exist. But if you can truly comprehend this and awaken to the
realisation that the nature of all forms is emptiness, then
instantaneously you perceive the pure Dharma-kāya of
Tathāgata.

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