[89] "And moreover, Meghiya, established in these five [dhammas], that bhikkhu should develop four dhammas further: foulness (asubhā) should be developed for the abandoning of lust (rāga); loving-kindness (mettā) should be developed for the abandoning of ill will (byāpāda); mindfulness of breathing (ānāpānasati) should be developed for the cutting off of thoughts (vitakka); the perception of impermanence (aniccasaññā) should be developed for the uprooting of the conceit 'I am' (asmimāna). For, Meghiya, in one who perceives impermanence the perception of non-self (anattasaññā) becomes established; one who perceives non-self attains the uprooting of the conceit 'I am' — Nibbāna in this very life."
Then the Blessed One, having understood this matter, on that occasion uttered this inspired utterance (udāna):
Petty thoughts, subtle thoughts,
when followed along, are elations of the mind;
not understanding these thoughts of the mind,
with a reeling mind (citta) one runs from existence to existence.
But understanding these thoughts of the mind,
one who is ardent (ātāpī) and mindful (satimā) restrains them;
these elations of the mind that are followed along —
one awakened abandons them without remainder.
The First Sutta.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.