17 Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people.
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What was the levetical priesthood? In what was the role of the high priest? From the beginning, God wanted to see His people as a community of faithful. But how it could have been possible to create such a community, if the nature of the fallen man is against it? It is clear that only in one way: by changing this nature.
Of course to transform it totally, before the coming of Christ was impossible, it was even not to think of it. But any influence of God on the nature, and including the nature of man, changes in a certain degree this nature. Certainly, such a change in itself does not guarantee still either righteousness, or what we call in the biblical books "holiness", this consecration, which makes again real communication with God, possibility which had been almost lost after the fall. But it gives the possibility for a new life.
And since it is about the people, about the community which should be sanctified constantly, it should have always been in these people a certain consecrated part, which in God's presence should not consecrate themselves episodically, for example once a week, and live a "usual" life for the rest of days, but constantly, as consecrated themselves the priests serving at the altar, who during their service had no right to withdraw from the Tabernacle, and later from the temple. After the coming of Jesus, it is already all the nation who had to consecrate itself, and not through intermediaries, but directly from the resuscitated.
So the resuscitated Messiah becomes for the believers the High priest, sanctifying them and opening to them the way to the Kingdom, where the transformation of the human nature and its sanctification will come true, opening to man such a spiritual life, which in principle is impossible in our not still transformed world.