Insight on the Scriptures volume 2 page paragraphs 6 &7 under: mediator
Holding the offices of Mediator and High Priest,Jesus Christ, being immortal, is always alive and able TO PLEAD FOR THOSE OF SPIRITUAL ISRAEL approaching God through him, so he MEDIATE THE NEW COVEMENT UNTIL THOSE PERSONS RECIEVING HIS MEDIATORIAL ASSISTANCE ARE SAVED COMPLETELY (Heb. 7:24,25) He is able to conduct matters to the successful completion of the new convenant. THOSE IN THE NEW COVENANT ARE EVENTUALLY INSTALLED IN THE HEAVENLY PRIESTHOOD AS UNDERPRIESTS WITH CHRIST THEIR HIGH PRIEST.-Re.5:9,10; 20:6
Blessings To Mankind in General:WHILE JESUS' MEDIATORSHIP OPERATES SOLELY TOWARD THOSE IN THE NEW COVENANT, HE IS ALSO GOD'S HIGH PREIST AND THE SEED OF ABRAHAM, In fullfilling his duties in these latter two positions, he will bring blessings to others of mankind, for all the nations are to be blessed by means of Abraham's seed. Those in the new covenant are the first blessed by Christ, the primary seed.( Ga.3:16,29), being brought in as associate members of the seed....