He should not be satisfied with being contrite alone. He should also do something: first, to prevent his sins or errors happening again and, second, to repair the wrongs he has already done. The first aim is fulfilled by learning why they are sinful or erroneous, perceiving their origin in his own weaknesses of character or capacity, and then unremittingly working at changing them through self-improvement. The second aim involves a practical and sacrificial effort.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1: Uplift Character > # 505