Penance

Repentance.

Pain; sorrow; suffering.

A means of repairing a sin committed, and obtaining pardon for it, consisting partly in the performance of expiatory rites, partly in voluntary submission to a punishment corresponding to the transgression. Penance is the fourth of seven sacraments in the Roman Catholic Church.

To impose penance; to punish.

remorse for your past conduct

voluntary self-punishment in order to atone for some wrongdoing