It is by the exercise and discharge of the office of Christ, as the king, priest, and prophet of the church, that we are redeemed, sanctified, and saved…the redemption and salvation of the church do not depend merely on this–that God has given one to be king, priest, and prophet of the church, by the acting of which offices it is redeemed and saved; but on the person of him who was so given unto us: as is fully attested, Isiah 9:6-7.

John Owen