12.
The Discourse on Observing Impermanence
147.
At Sāvatthī.
"For a son of good family who has gone forth out of faith, monks, this is in conformity with the Teaching -
that he should dwell observing impermanence in matter.
In feeling,
in perception,
in activities,
he should dwell observing impermanence in consciousness, etc.
'He is released from suffering', I say."
The twelfth.