Once a Catholic’s joyous salvation is established, then they can proceed to understand, answer, and accept the following:
Was Jesus sacrificed once and for all?
Or, is He the sacrificial “Victim” continually, again and again (as oft as we sin, or, as oft as we gather) on a daily basis?
Romans 6:8-10. -Paul, the Apostle, to the Church at Rome, First Century A.D.
8 “Now if we died with Christ, we believe that we shall also live with Him, 9 knowing that Christ, having been raised from the dead, dies no more. Death no longer has dominion over Him. 10 For the death that He died, He died to sin once for all; but the life that He lives, He lives to God.”
Hebrews 7:22-28. Paul, to the Christian Jews (and us).
22 “…so much more Jesus has become a surety [guarantee] of a better covenant. 23 Also there were many priests, because they were prevented by death from continuing. 24 But He, because He continues forever, has an unchangeable priesthood. 25 Therefore He is also able to save to the uttermost those who come to God through Him, since He always lives to make intercession for them. 26 For such a High Priest was fitting for us, who is holy, harmless, undefiled, separate from sinners, and has become higher than the heavens; 27 who does not need daily, as those high priests, to offer up sacrifices, first for His own sins and then for the people’s, for this He did once for all when He offered up Himself. 28 For the law appoints as high priests men who have weakness, but the word of the oath, which came after the law, appoints the Son who has been perfected forever.”
In Hebrews, Paul does profoundly (if not prophetically) touch on familiar fallible similarities of Jewish and Catholic priesthoods, as compared to Jesus’ own infallible, unchangeable and non-transferable Priesthood (similar to the order of Melchizedek).
(-Mel was the sole priest in his order.)
Hebrews 9:11-28. Paul.
11 “But Christ came as a High Priest of the good things to come, with the greater and more perfect tabernacle not made with hands, that is, not of this creation. 12 Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once and for all, having obtained eternal redemption.”
Hebrews 10:10-25. Paul.
10 “…we have been sanctified through the offering of the body of Jesus Christ once for all. 11 And every priest stands ministering daily and offering repeatedly the same sacrifices, which can never take away sins. 12 But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God, 13 from that time waiting till His enemies are made His footstool. 14 For by one offering He has perfected forever those who are being sanctified…18 Now where there is remission of these [sins], there is no longer an offering for sin…”
1 Peter 3:18. Peter - himself!
“For Christ also suffered once for sins, the just for the unjust, that He might bring us to God, being put to death in the flesh but made alive by the Spirit…”
“He who did not spare His own Son, but delivered Him up for us all, shall He not freely give us all things?” -Romans 8:32. Paul.
In the past tense, yes? -A done deal. (And, of course, all Bible Scriptures should be noted in their context.)