NOTES for Heb 7:11-19
Turning to the theme of the Torah (the Law), the author of the epistle reasons about it in the same way as his teacher Paul. He sees several levels of Torah: on the one hand, Torah as legislation, as a legal and moral code, and on the other, the inner Torah as a spiritual core and a spiritual and moral imperative that defines a person's relationship with God and his whole life. It is clear that the author of the epistle looks at Christ in the same way as all Christians of that time did: as the only example in the history of the people of God of the living Torah.
Continuing Paul's thought about the Torah and extending it to the Levitical priesthood, he says: just as the Torah by itself does not make a person perfect, so the priesthood existing within the framework of such a Torah, which does not bring to perfection, cannot sanctify the people in all fullness. Paul speaks often and at length in his epistles about the fact that the Torah, even the inner Torah, still does not make a person perfect, that it cannot qualitatively change human nature and free it from the power of sin. But the Levitical priests are the same sinful people as everyone else; none of them revealed to the world examples of the living Torah. And if so, then the sanctification by which God sanctified the people through their priestly action could not be complete. The fullness of the Torah is the living Torah, and the living Torah is Christ Himself.
In Christ there is a change, or alteration, of the Torah, and therefore the priesthood must also change. Of course, this does not mean that some other priestly community or corporation should come to replace the Levitical priesthood. The point is different: it concerns the manner and fullness of the people's sanctification, corresponding to the new quality of their life. In fact, for life in the Kingdom, for abiding as part of the body of Christ, a Christian must be sanctified in all the fullness possible for him, in a way he was never sanctified through Yahwist sacrifices, because no person in a fallen state can be sanctified completely.
But now, in the process of a person becoming a living Torah (and the path in Christ, the path of becoming like Christ, was understood by the first generations of Christians precisely as a person's becoming in Christ as the living Torah), he must be sanctified precisely in fullness, since it is given to him as a created being. And such sanctification is possible only in that spiritual space of the relationship between the Father and the Son where the Church also abides. There the High Priest is already Christ Himself, and the fullness of sanctification also proves to correspond to Him.