The tremendous effect of Christ’s obedience to the will of the Father by which we are sanctified (verse 10) was achieved by just one offering. Where the multitude of sacrifices offered by the Old Testament priests over many centuries achieved nothing, Christ’s one offering was sufficient to atone for all the sins of all who will ever be saved.
You will not find this teaching in the Roman Catholic Church. In AD 597 Augustine arrived at Canterbury in Kent with a party of 40, sent by Pope Gregory I. They came chanting in Latin with all the paraphernalia of the Roman Catholic Church, and they came to seize Britain for the Pope. He managed to ‘convert’ Ethelred the king, who thought Augustine had magical power, but there was not true conversion; he undertook to be loyal to the Roman Catholic Church. Ten thousand were ‘converted’ in a day and baptised, but this was just a matter of allegiance, homage. It is a religion of ceremonies – composed and devised by men. Are there not ceremonies in the Bible? Yes, but the Old Testament were not efficacious; the ceremonies of the Roman Catholic Church are supposed to actually achieve something. Roman Catholicism is a religion of priests – go-betweens. We have one high priest, Christ, and we go direct to God through him. The Roman Catholic Church stands in the way with a system of human mediators. They teach that the Eucharist is a sacrifice in which ‘Christ gives us the very body he offered up on the cross, the very blood which he poured out for many for the forgiveness of sins’ (Catechism of the Catholic Church). At the words of the priest, the bread and wine supposedly ‘become the body and blood of Christ’ (Catechism of the Catholic Church), and consequently all are to show to the sacrament the worship which is due to the true God (Vatican Council II). There is much double speak in the teaching of the Roman Catholic church, but to call the Mass a sacrifice and to teach that Christ has ‘instituted the Eucharistic sacrifice of his Body and Blood so that he might perpetuate the sacrifice of the cross throughout the centuries till his coming’ (Vatican Council II) is to deny that Christ has ‘by one offering perfected them that are sanctified.’