Samyutta Nikaya 42.8 wrote:A disciple has faith in (the Buddha) and reflects: 'The Blessed One in a variety of ways criticizes & censures the taking of life, and says, "Abstain from taking life." There are living beings that I have killed, to a greater or lesser extent. That was not right. That was not good. But if I become remorseful for that reason, that evil deed of mine will not be undone.' So, reflecting thus, he abandons right then the taking of life, and in the future refrains from taking life. This is how there comes to be the abandoning of that evil deed. This is how there comes to be the transcending of that evil deed.
"[He reflects:] 'The Blessed One in a variety of ways criticizes & censures stealing... indulging in illicit sex... the telling of lies, and says, "Abstain from the telling of lies." There are lies that I have told, to a greater or lesser extent. That was not right. That was not good. But if I become remorseful for that reason, that evil deed of mine will not be undone.' So, reflecting thus, he abandons right then the telling of lies, and in the future refrains from telling lies. This is how there comes to be the abandoning of that evil deed. This is how there comes to be the transcending of that evil deed.
"Having abandoned the taking of life, he refrains from taking life. Having abandoned stealing, he refrains from stealing. Having abandoned illicit sex, he refrains from illicit sex. Having abandoned lies, he refrains from lies. Having abandoned divisive speech, he refrains from divisive speech. Having abandoned harsh speech, he refrains from harsh speech. Having abandoned idle chatter, he refrains from idle chatter. Having abandoned covetousness, he becomes uncovetous. Having abandoned ill will & anger, he becomes one with a mind of no ill will. Having abandoned wrong views, he becomes one who has right views.
"That disciple of the noble ones, headman — thus devoid of covetousness, devoid of ill will, unbewildered, alert, mindful — keeps pervading the first direction [the east] with an awareness imbued with good will, likewise the second, likewise the third, likewise the fourth. Thus above, below, & all around, everywhere, in its entirety, he keeps pervading the all-encompassing cosmos with an awareness imbued with good will — abundant, expansive, immeasurable, without hostility, without ill will. Just as a strong conch-trumpet blower can notify the four directions without any difficulty, in the same way, when the awareness-release through good will is thus developed, thus pursued, any deed done to a limited extent no longer remains there, no longer stays there.
"That disciple of the noble ones — thus devoid of covetousness, devoid of ill will, unbewildered, alert, mindful — keeps pervading the first direction with an awareness imbued with compassion... appreciation... equanimity, likewise the second, likewise the third, likewise the fourth. Thus above, below, & all around, everywhere, in its entirety, he keeps pervading the all-encompassing cosmos with an awareness imbued with equanimity — abundant, expansive, immeasurable, without hostility, without ill will. Just as a strong conch-trumpet blower can notify the four directions without any difficulty, in the same way, when the awareness-release through equanimity is thus developed, thus pursued, any deed done to a limited extent no longer remains there, no longer stays there."
From:
Sankha Sutta translated from the Pali by Thanissaro Bhikkhu