5.
The Discourse on Suffering
165.
"There are these three kinds of suffering, monks.
Which three?
Suffering as suffering, suffering due to activities, suffering due to change -
these, monks, are the three kinds of suffering.
For the direct knowledge, full understanding, utter elimination, and abandoning of these three kinds of suffering, monks, etc.
the eightfold path is to be developed."
The fifth.