Repentance is a change of thought to correct a wrong and gain forgiveness from a person who is wronged. In religious contexts it usually refers to confession to God, ceasing sin against God, and resolving to live a more responsible and humane life. It typically includes an admission of guilt, a promise or resolve not to repeat the offense; an attempt to make restitution for the wrong, or in some way to reverse the harmful effects of the wrong where possible.
Repentance is the activity of reviewing one’s actions and feeling contrition or regret for past wrongs, which is accompanied by a commitment to change for the better. It is generally seen as involving a commitment to personal change and the resolve to live a more responsible and humane life.
Atonement means that two parties, estranged from each other because one of them offends the other, eventually reconcile with each other. It usually contains two stages: 1) the offender’s act of expiation for forgiveness from the offended party, and 2) reconciliation, which is a regained state of unity thereafter.