14 Still later he appeared to the eleven disciples as they were eating together. He rebuked them for their stubborn unbelief because they refused to believe those who had seen him after he had been raised from the dead. 15 And then he told them, "Go into all the world and preach the Good News to everyone. 16 Anyone who believes and is baptized will be saved. But anyone who refuses to believe will be condemned. 17 These miraculous signs will accompany those who believe: They will cast out demons in my name, and they will speak in new languages. 18 They will be able to handle snakes with safety, and if they drink anything poisonous, it won't hurt them. They will be able to place their hands on the sick, and they will be healed."
19 When the Lord Jesus had finished talking with them, he was taken up into heaven and sat down in the place of honor at God's right hand.
Matthew Henry's Commentary on Mark 16:14-19
Commentary on Mark 16:14-18
(Read Mark 16:14-18)
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.
Commentary on Mark 16:19-20
(Read Mark 16:19-20)
After the Lord had spoken he went up into heaven. Sitting is a posture of rest, he had finished his work; and a posture of rule, he took possession of his kingdom. He sat at the right hand of God, which denotes his sovereign dignity and universal power. Whatever God does concerning us, gives to us, or accepts from us, it is by his Son. Now he is glorified with the glory he had before the world. The apostles went forth, and preached every where, far and near. Though the doctrine they preached was spiritual and heavenly, and directly contrary to the spirit and temper of the world; though it met with much opposition, and was wholly destitute of all worldly supports and advantages; yet in a few years the sound went forth unto the ends of the earth. Christ's ministers do not now need to work miracles to prove their message; the Scriptures are proved to be of Divine origin, and this renders those without excuse who reject or neglect them. The effects of the gospel, when faithfully preached, and truly believed, in changing the tempers and characters of mankind, form a constant proof, a miraculous proof, that the gospel is the power of God unto salvation, of all who believe.