And they went forth, and preached every where, the Lord working with them, and confirming {f} the word with signs following. Amen.

(f) That is, the doctrine: therefore doctrine must go before and signs must follow after.

People's New Testament

16:20 They went forth, and preached every where. Acts of the Apostles is the history of their preaching. It should be studied to see how the Apostles understood and preached the Commission of the Lord. The Commission of Christ is to his Church; its field is the world; its work is to preach the gospel; its congregation embraces every creature; its offer is a free and full salvation; the conditions of salvation are faith in Christ, and obedience to him; the consequence of rejecting Christ's salvation is eternal condemnation.

Wesley's Notes

16:20 They preached every where - At the time St. Mark wrote, the apostles had already gone into all the known world, Rom 10:18; and each of them was there known where he preached: the name of Christ only was known throughout the world.

Jamieson-Fausset-Brown Bible Commentary

20. And they went forth, and preached everywhere, the Lord working with them, and confirming the word with signs following. Amen-We have in this closing verse a most important link of connection with the Acts of the Apostles, where He who directed all the movements of the infant Church is perpetually styled "The Lord"; thus illustrating His own promise for the rounding and building up of the Church, "Lo, I AM WITH You alway!"

Matthew Henry's Concise Commentary

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.