This is a question of practical interest. My personal practice is generally to feel guilty for bad deeds, but today I tried admitting fault and guilt without feeling guilty, and it was much less stressful. I do not know which is correct. Is there any textual evidence on whether the Buddha suggested feeling remorse or not?
Sutta 42.8 from the Samyutta Nikaya, Sankha Sutta, discusses remorse, but the following two translations seem to contradict each other, in which one mentions remorse is not useful, whereas the other mentions that remorse is part of reflecting on having done something not good. Is one of these translations more historically accurate than the other?
The Access To Insight translation reads:
'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.
The Sutta Central translation reads:
But consider when a Realized One arises in the world… In many ways he criticizes and denounces killing living creatures… And there’s a disciple who is devoted to that teacher. Then they reflect: ‘In many ways the Buddha criticizes and denounces killing living creatures, saying: “Stop killing living creatures!” But I have killed living creatures to a certain extent. That’s not right, it’s not good, and I feel remorseful because of it. But I can’t undo what I have done.’ Reflecting like this, they give up killing living creatures, and in the future they don’t kill living creatures.
(I’ve been trying to translate the Pali but I've only gotten so far as that one should "renounce" the evil deed.)