Catholic moral theology today, especially virtue ethics, often bears little connection to the sacraments; Catholic ethicists largely do not discuss the sacramental life when they address issues of morality or concepts of virtue. Given this disconnect, Thomas Aquinas's consideration of penance in the Summa Theologiae provides an important way to reconnect virtue to sacrament, as well as to emphasize virtue in relation to God. Penance is both a virtue and a sacrament inasmuch as it involves acts of the will. As a virtue, penance is a species of justice, an act of the will choosing according to right reason in aiming to amend for offenses against God. The acts of the virtue of penance, especially contrition, confession and satisfaction, constitute the matter of the sacrament of penance. Hence the sacrament presupposes the virtue even though the sacrament is a cause of grace whereas the virtue is an effect of grace. Penance as sacrament and virtue are virtually inseparable. A reclamation of penance as virtue and sacrament in the field of Catholic moral theology highlights the role of grace and hence connection of virtue to God, while also re-grounding virtue ethics in the sacramental life, especially through the sacrament of penance.