 The grave act is often revoked in response to sincere penance, which may be manifested through public recantation, sometimes through the Sacrament of Confession, piety or through mortification of the flesh.Within the Catholic Church, there are differences between the discipline of the majority Latin Church regarding excommunication and that of the Eastern Catholic Churches.Excommunication can be either "latae sententiae" (automatic, incurred at the moment of committing the offense for which canon law imposes that penalty) or "ferendae sententiae" (incurred only when imposed by a legitimate superior or declared as the sentence of an ecclesiastical court).