IV. They only benefit by the blood of Christ who truly share in His death and resurrection.
What hope then do they, who deny the reality of the human person in our Saviour's body, leave for themselves in the efficacy of this mystery? Let them say by what sacrifice they have been reconciled, by what blood-shedding brought back. Who is He “who gave Himself for us an offering and a victim to God for a sweet smell:” or what sacrifice was ever more hallowed than that which the true High priest placed upon the altar of the cross by the immolation of His own flesh? For although in the sight of the Lord the death of many of His saints has been precious, yet no innocent's death was the propitiation of the world.
The righteous have received, not given, crowns: and from the endurance of the faithful have arisen examples of patience, not the gift of justification. For their deaths affected themselves alone, and no one has paid off another's debt by his own death: one alone among the sons of men, our Lord Jesus Christ, stands out as One in whom all are crucified, all dead, all buried, all raised again. Of them He Himself said “when I am lifted from the earth, I will draw all (things) unto Me.”
True faith also, that justifies the transgressors and makes them just, is drawn to Him who shared their human natures and wins salvation in Him, in whom alone man finds himself not guilty; and thus is free to glory in the power of Him who in the humiliation of our flesh engaged in conflict with the haughty foe, and shared His victory with those in whose body He had triumphed.
Source: Letters (New Advent)