[258] Bhikkhus, if, while that bhikkhu is attending to another sign (nimitta) apart from that sign — one connected with the wholesome — there still arise evil, unwholesome thoughts (vitakka) connected with desire, connected with hatred, and connected with delusion, then, bhikkhus, that bhikkhu should examine the danger (ādīnava) of those thoughts thus: 'Thus these thoughts are unwholesome; thus these thoughts are blameworthy; thus these thoughts have suffering (dukkha) as their result.' As he examines the danger of those thoughts, whatever evil, unwholesome thoughts there are — connected with desire, connected with hatred, and connected with delusion — are abandoned; they come to an end. With their abandonment, the mind (citta) becomes steadied internally, settles down, becomes unified, and becomes concentrated.
Just as, bhikkhus, a woman or a man — young, youthful, fond of adornment — would be horrified, humiliated, and disgusted by the carcass of a snake, the carcass of a dog, or the carcass of a human being hung around the neck; even so, bhikkhus, if, while that bhikkhu is attending to another sign apart from that sign — one connected with the wholesome — there still arise evil, unwholesome thoughts connected with desire, connected with hatred, and connected with delusion, then, bhikkhus, that bhikkhu should examine the danger of those thoughts thus: 'Thus these thoughts are unwholesome; thus these thoughts are blameworthy; thus these thoughts have suffering as their result.' As he examines the danger of those thoughts, whatever evil, unwholesome thoughts there are — connected with desire, connected with hatred, and connected with delusion — are abandoned; they come to an end. With their abandonment, the mind becomes steadied internally, settles down, becomes unified, and becomes concentrated.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.