But the Baptist’s equipment for the most responsible office of proclaiming the Messiahship of Jesus was not completed by his own saintliness of character and keen perception of the people’s needs, and knowledge of Jesus, and incorruptible truthfulness. There was given to him a sign from heaven, that he might be strengthened to bear this responsibility, and that the Messiah might never seem to be only of the Baptist’s appointing and not of God’s. Some degree of disappointment may be felt that external signs should have intruded on so profoundly spiritual and real an occasion as the baptism of Christ. Some may be ready to ask, with Keim, “Is it, or was it ever, the way of God, in the course of His spiritual world, above all upon the threshold of spiritual decisions affecting the fate of the world, and in contradiction to the wise economy of revelation pursued by His supreme ambassador Himself, to take away from seeking and finding souls the labour of deciding their own destiny?” But this is to suppose that the signs at the baptism of Jesus were mainly for His encouragement, whereas John describes them as being given for the certification of the Baptist. “I knew Him not”—that is, I did not know He was the Messiah—“but He that sent me to baptize with water, He said unto me, Upon whomsoever thou shalt see the Spirit descending, and abiding upon Him, the same is He that baptizeth with the Holy Spirit. And I have seen, and have borne witness that this is the Son of God.”

The baptism of Jesus was, in fact, His anointing as the Messiah; and this anointing by which He became the Christ was an anointing, not with a symbolic oil, but with the Divine Spirit (Acts x. 38). This Spirit descended upon Him “in a _bodily_ shape” (Luke iii. 22), because it was not one member or faculty or power which was communicated to Jesus, but a whole _body_ or complete equipment of all needful Divine energies for His work. “God giveth not the Spirit by measure unto Him;” there is no gauge, no metre checking the supply. Now for the first time can the whole Spirit be given, because now for the first time in Jesus is there room to receive it. And that the Baptist may confidently proclaim Him as King the sign is given,—not the outward sign alone, but the outward sign accompanying and tallying with the inward sign; for it was not said to the Baptist, “Upon whomsoever thou shalt see a dove descend,” but, “upon whomsoever thou shalt see the Spirit descend.”

The Expositor's Bible: The Gospel of St. John, Vol. I — Part 23