designates Peter as the "rock" upon which Christ's church will be built. Deze lieve en ondeugende jonge vrouw wacht op u! Christianity: The First Three Thousand Years. XXX Ontdenk meer over mij. (1995) The HarperCollins Encyclopedia of Catholicism. 176 Essential to this sacrament are acts both by the sinner (examination of conscience, contrition with a determination not to sin again, confession to a priest, and performance of some act to repair the damage caused by sin) and by the priest (determination of the.