[357] Suppose, Bhikkhus, a man were to drop a blazing grass torch into a thicket of dry grass. If he did not quickly extinguish it with his hands and feet, then, Bhikkhus, the living beings dependent on grass and wood would meet with calamity and disaster. Even so, Bhikkhus, whatever ascetic or brahmin does not quickly abandon, dispel, obliterate, and bring to non-existence an arisen unwholesome perception (akusalasaññā) that has gone astray (visamagatā), he dwells in suffering (dukkha) in this very life, with vexation, with despair, with fever; and with the breakup of the body, after death, a bad destination is to be expected.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.