As to the idea that the sacrifice of Christ on the cross was made “once and for all”, thus allowing no sacrificial quality in the Eucharist: The fullness of any act includes all causes and all effects, even extended in time before or after the “act” itself. The Eucharistic sacrifice and communion includes all who have and who will partake in it. The Eucharistic sacrifice includes the redemptive mediation of the entire body of Christ, past, current and future.