http://www.accesstoinsight.org/tipitaka/mn/mn.0…
“Now, Aggivessana, this body — endowed with form, composed of
the four primary elements, born from mother & father, nourished
with rice & porridge, subject to inconstancy, rubbing,
pressing, dissolution, and dispersion — should be envisioned as
inconstant, stressful, a disease, a cancer, an arrow, painful, an
affliction, alien, a disintegration, an emptiness, not-self. In one
who envisions the body as inconstant, stressful, a disease, a
cancer, an arrow, painful, an affliction, alien, a disintegration,
an emptiness, not-self, any desire for the body, attraction to the
body, following after the body is abandoned.
“There are these three kinds of feeling: a pleasant feeling, a
painful feeling, and neither-pleasant-nor-painful feeling. On the
occasion when one feels a pleasant feeling, one does not feel
either a painful feeling or a neither-pleasant-nor-painful feeling.
One feels only a pleasant feeling on that occasion. On the occasion
when one feels a painful feeling, one does not feel either a
pleasant feeling or a neither-pleasant-nor-painful feeling. One
feels only a painful feeling on that occasion. On the occasion when
one feels a neither-pleasant-nor-painful feeling feeling, one does
not feel either a pleasant feeling or a painful feeling. One feels
only a neither-pleasant-nor-painful feeling on that occasion.
“A pleasant feeling is inconstant, fabricated, dependently
co-arisen, subject to ending, subject to vanishing, fading,
ceasing. A painful feeling is also inconstant, fabricated,
dependently co-arisen, subject to ending, subject to vanishing,
fading, ceasing. A neither-pleasant-nor-painful feeling is also
inconstant, fabricated, dependently co-arisen, subject to ending,
subject to vanishing, fading, ceasing.
“Seeing this, an instructed disciple of the noble ones grows
disenchanted with pleasant feeling, disenchanted with painful
feeling, disenchanted with neither-pleasant-nor-painful feeling.
Disenchanted, he grows dispassionate. From dispassion, he is
released. With release, there is the knowledge, ‘Released.’ He
discerns, ‘Birth is ended, the holy life fulfilled, the task done.
There is nothing further for this world.’ A monk whose mind is thus
released does not take sides with anyone, does not dispute with
anyone. He words things by means of what is said in the world but
without grasping at it.”
Now at that time Ven. Sariputta was sitting2 behind the Blessed One, fanning
him. The thought occurred to him, “Indeed, it seems that the
Blessed One speaks to us of the abandoning of each of these mental
qualities through direct knowledge.[3] Indeed, it seems that the
One Well-gone speaks to us of the relinquishing of each of these
mental qualities through direct knowledge.”[4] As Ven. Sariputta
was reflecting thus, his mind was released from fermentations
through not-clinging. While in LongNails the wanderer there arose
the dustless, stainless Dhamma eye: “Whatever is subject to
origination is all subject to cessation.”