13.
The Discourse on Observing Suffering
148.
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 suffering in matter.
In feeling,
in perception,
in activities,
he should dwell observing suffering in consciousness, etc.
'He is released from suffering', I say."
The thirteenth.