“Bhikkhus, in three cases ardor should be exercised. What three? (1) Ardor should be exercised for the non-arising of unarisen bad unwholesome qualities. (2) Ardor should be exercised for the arising of unarisen wholesome qualities. (3) Ardor should be exercised for enduring arisen bodily feelings that are painful, racking, sharp, piercing, harrowing, disagreeable, sapping one’s vitality. In these three cases ardor should be exercised.

“When a bhikkhu exercises ardor for the non-arising of unarisen bad unwholesome qualities, for the arising of unarisen wholesome qualities, and for enduring arisen bodily feelings that are painful, racking, sharp, piercing, harrowing, disagreeable, sapping one’s vitality, he is called a bhikkhu who is ardent, alert, and mindful in order to make a complete end of suffering.”