4:15-22 All the care of the rulers is, that the doctrine of Christ spread not among the people, yet they cannot say it is false or dangerous, or of any ill tendency; and they are ashamed to own the true reason; that it testifies against their hypocrisy, wickedness, and tyranny. Those who know how to put a just value upon Christ's promises, know how to put just contempt upon the world's threatenings. The apostles look with concern on perishing souls, and know they cannot escape eternal ruin but by Jesus Christ, therefore they are faithful in warning, and showing the right way. None will enjoy peace of mind, nor act uprightly, till they have learned to guide their conduct by the fixed standard of truth, and not by the shifting opinions and fancies of men. Especially beware of a vain attempt to serve two masters, God and the world; the end will be, you can serve neither fully.

13-17. perceived that they were unlearned and ignorant men—that is, uninstructed in the learning of the Jewish schools, and of the common sort; men in private life, untrained to teaching.

took knowledge of them that they had been with Jesus—recognized them as having been in His company; remembering possibly, that they had seen them with Him [Meyer, Bloomfield, Alford]; but, more probably, perceiving in their whole bearing what identified them with Jesus: that is, "We thought we had got rid of Him; but lo! He reappears in these men, and all that troubled us in the Nazarene Himself has yet to be put down in these His disciples." What a testimony to these primitive witnesses! Would that the same could be said of their successors!