This is he of whom I said, 'After me comes a man who is preferred before me, for he was before me.'
      (2.) That he was told to expect it, which very much corroborates the proof. It was not John's bare conjecture, that surely he on whom he saw the Spirit descending was the Son of God; but it was an instituted sign given him before, by which he might certainly know it (John 1:33; John 1:33): I knew him not. He insists much upon this, that he knew no more of him than other people did, otherwise than by revelation. But he that sent me to baptize gave me this sign, Upon whom thou shalt see the Spirit descending, the same is he. [1.] See here what sure grounds John went upon in his ministry and baptism, that he might proceed with all imaginable satisfaction. First, He did not run without sending: God sent him to baptize. He had a warrant from heaven for what he did. When a minister's call is clear, his comfort is sure, though his success is not always so. Secondly, He did not run without speeding; for, when he was sent to baptize with water, he was directed to one that should baptize with the Holy Ghost. Under this notion John Baptist was taught to expect Christ, as one who would give that repentance and faith which he called people to, and would carry on and complete that blessed structure of which he was now laying the foundation. Note, It is a great comfort to Christ's ministers, in their administration of the outward signs, that he whose ministers they are can confer the grace signified thereby, and so put life, and soul, and power into their ministrations; can speak to the heart what they speak to the ear, and breathe upon the dry bones to which they prophesy. [2.] See what sure grounds he went upon in his designation of the person of the Messiah. God had before given him a sign, as he did to Samuel concerning Saul: "On whom thou shalt see the Spirit descend, that same is he." This not only prevented any mistakes, but gave him boldness in his testimony. When he had such assurance as this given him, he could speak with assurance. When John was told this before, his expectations could not but be very much raised; and, when the event exactly answered the prediction, his faith could not but be much confirmed: and these things are written that we may believe.