ViHinei Parach matei aharon 5745,

Class One. First level of Birchas Kohanim: it comes from the highest level and therefore descends to the lowest place and is guarded there.

Class Two. Birchas kohanim cont. 2) the matei Aharon reveals the infinity of the Bracha of the Kihuna from the beginning, 3) The Birchas kohanim transform evil to good. This would not be revealed if it weren’t for korach and his efforts.