Experience has taught us that remorse is the offspring of a repentant heart. It hinges in elements of self-rebuke, guilt and the search for personal inner peace, in your circumstances. The troubled soul finds a quiet moment to dialogue with itself. It admits to itself that it has failed, either through doing or by failing to do something. It makes a private apology to itself and a public confession to others. It seeks reconciliation with the wronged party.
Hence, the perpetrator of a heinous act will recognise it for what it is. He will accept his negative responsibility and make an unconditional public admission, while craving forgiveness. Conversely, someone who failed to act when s/he should have acted may say, “Forgive me. I let you down. I knew about your situation. I had the capacity to help. Yet I did nothing. I failed you. I am sorry.”