“And since in this divine sacrifice, which is celebrated in the Mass, that same Christ is contained and immolated in an unbloody manner, who on the altar of the Cross ‘once offered Himself’ in a bloody manner [Heb. 9:27], the holy Synod teaches that this is truly propitiatory [can. 3], and has this effect, that if contrite and penitent we approach God with a sincere heart and right faith, with fear and reverence, ‘we obtain mercy and find grace in seasonable aid’ [ Heb. 4:16]. For, appeased by this oblation, the Lord, granting the grace and gift of penitence, pardons crimes and even great sins. For, it is one and the same Victim, the same one now offering by the ministry of the priests as He who then offered Himself on the Cross, the manner of offering alone being different. The fruits of that oblation (bloody, that is) are received most abundantly through this unbloody one; so far is the latter from being derogatory in any way to Him [can. 4]. Therefore, it is offered rightly according to the tradition of the apostles [can. 3], not only for the sins of the faithful living, for their punishments and other necessities, but also for the dead in Christ not yet fully purged.”  Pope Pius IV, Council of Trent, Session 22, Sep. 17, 1562, Ch. 2  (Denz. 940)