I. The first truth which is brought before us in these verses is, that Jesus, who is not ashamed to call Himself brother, and us His brethren, is one with us. We who are sanctified by Him, and He who sanctifies, are of one. Christ is He who sanctifies. The source and power of sanctification are in Jesus the Son of God, our Saviour. He is the foundation, source, method, and channel of our sanctification. The Holy Ghost, the Comforter, is sent by Christ to glorify Him, and to reveal and appropriate to us His salvation. We are conformed to the image of Christ by the Spirit, as coming from Christ in His glorified humanity. II. Jesus, by His experience, by His sufferings, and, above all, by His death, has become a merciful and faithful High Priest. We are now on earth, in the flesh, sin around and within us. How can the Holy God look on us, and grant us blessings? How can there be communion between heaven and earth? Jesus is ascended, and having put away sin by the sacrifice of Himself, presents us to the Father, and we are holy and unblameable before Him, and Father, Son, and Holy Ghost are able to send down the fulness of blessings, of grace and strength; to have communion with us, notwithstanding all our sin and defilement. Christ is a merciful High Priest, not merely full of pity, compassion, and grace, but full of sympathy. He is most lovingly and earnestly anxious that we should always obtain the victory, and suffer no injury; for having gone through all the conflict Himself, without a single moment's wavering or surrender, He wishes us to be found continually in Him, and to conquer continually. He is faithful in bringing down to us all the gifts of God; all the counsel, will, and blessings of the Most High; faithful in taking up to God all our need and trial; all our petitions, fears, and tears; all our sufferings, and all our works.
A. Saphir, Expository Lectures on the Hebrews,vol. i., p. 142.