Mark 16:17

3. What power they should be endowed with, for the confirmation of the doctrine they were to preach (v. 17); These signs shall follow them that believe. Not that all who believe, shall be able to produce these signs, but some, even as many as were employed in propagating the faith, and bringing others to it; for signs are intended for them that believe not; see 1 Cor 14 22. It added much to the glory and evidence of the gospel, that the preachers not only wrought miracles themselves, but conferred upon others a power to work miracles, which power followed some of them that believed, wherever they went to preach. They shall do wonders in Christ's name, the same name into which they were baptized, in the virtue of power derived from him, and fetched in by prayer. Some particular signs are mentioned; (1.) They shall cast out devils; this power was more common among Christians than any other, and lasted longer, as appears by the testimonies of Justin Martyr, Origen, Irenæus, Tertullian Minutius Felix, and others, cited by Grotius on this place. (2.) They shall speak with new tongues, which they had never learned, or been acquainted with; and this was both a miracle (a miracle upon the mind), for the confirming of the truth of the gospel, and a means of spreading the gospel among those nations that had not heard it. It saved the preachers a vast labour in learning the languages; and, no doubt, they who by miracle were made masters of languages, were complete masters of them and of all their native elegancies, which were proper both to instruct and affect, which would very much recommend them and their preaching. (3.) They shall take up serpents. This was fulfilled in Paul, who was not hurt by the viper that fastened on his hand, which was acknowledged a great miracle by the barbarous people, Acts 28 5, 6. They shall be kept unhurt by that generation of vipers among whom they live, and by the malice of the old serpent. (4.) If they be compelled by their persecutors to drink any deadly poisonous thing, it shall not hurt them: of which very thing some instances are found in ecclesiastical history. (5.) They shall not only be preserved from hurt themselves, but they shall be enabled to do good to others; They shall lay hands on the sick, and they shall recover, as multitudes had done by their master's healing touch. Many of the elders of the church had this power, as appears by Jam 5 14, where, as an instituted sign of this miraculous healing, they are said to anoint the sick with oil in the name of the Lord. With what assurance of success might they go about executing their commission, when they had such credentials as these to produce!

Verses 14-18 The evidences of the truth of the gospel are so full, that those who receive it not, may justly be upbraided with their unbelief. Our blessed Lord renewed his choice of the eleven as his apostles, and commissioned them to go into all the world, to preach his gospel to every creature. Only he that is a true Christian shall be saved through Christ. Simon Magus professed to believe, and was baptized, yet he was declared to be in the bonds of iniquity: see his history in ( Acts 8:13-25 ) . Doubtless this is a solemn declaration of that true faith which receives Christ in all his characters and offices, and for all the purposes of salvation, and which produces its right effect on the heart and life; not a mere assent, which is a dead faith, and cannot profit. The commission of Christ's ministers extends to every creature throughout the world, and the declarations of the gospel contain not only truths, encouragements, and precepts, but also most awful warnings. Observe what power the apostles should be endued with, for confirming the doctrine they were to preach. These were miracles to confirm the truth of the gospel, and means of spreading the gospel among nations that had not heard it.