Aṅguttara Nikāya 4.147 15.

Dutiyakālasutta

Ābhāvagga Dutiyakālasutta “Cattārome, bhikkhave, kālā sammā bhāviyamānā sammā anuparivattiyamānā anupubbena āsavānaṁ khayaṁ pāpenti.

Disciples, there are these four times which, when developed and pursued correctly, gradually lead to the destruction of the taints.

Katame cattāro?

What are the four?

Kālena dhammassavanaṁ, kālena dhammasākacchā, kālena sammasanā, kālena vipassanā— Ime kho, bhikkhave, cattāro kālā sammā bhāviyamānā sammā anuparivattiyamānā anupubbena āsavānaṁ khayaṁ pāpenti.

Listening to the Dhamma at the right time, discussing the Dhamma at the right time, thorough investigation at the right time, and insight at the right time.

These are the four times which, when developed and pursued correctly, gradually lead to the destruction of the taints.

Seyyathāpi, bhikkhave, uparipabbate thullaphusitake deve vassante taṁ udakaṁ yathāninnaṁ pavattamānaṁ pabbatakandarapadarasākhā paripūreti; pabbatakandarapadarasākhā paripūrā kusobbhe paripūrenti; kusobbhā paripūrā mahāsobbhe paripūrenti; mahāsobbhā paripūrā kunnadiyo paripūrenti; kunnadiyo paripūrā mahānadiyo paripūrenti; mahānadiyo paripūrā samuddaṁ paripūrenti.

Just as when rain falls on the mountain top, the water flows down and fills the mountain clefts, gullies, and channels; when these are full, they fill the small ponds; when the small ponds are full, they fill the large lakes; when the large lakes are full, they fill the small rivers; when the small rivers are full, they fill the great rivers; and when the great rivers are full, they fill the ocean.

Evamevaṁ kho, bhikkhave, ime cattāro kālā sammā bhāviyamānā sammā anuparivattiyamānā anupubbena āsavānaṁ khayaṁ pāpentī”ti. Sattamaṁ.

In the same way these four times, when developed and pursued correctly, gradually lead to the destruction of the taints.