John Calvin on Acts 4:23

23. Furthermore when they were let go. It shall appear by and by to what end they declared to the other disciples what things had befallen them, to wit, that they might be the more emboldened and encouraged by the grace of God hereafter; secondly, that they might arm themselves with prayer against the furious threatenings of their enemies; and thus must the children of God do, one must prick forward another, and they must join hand in hand, that they may vanquish the common adversary fighting under Christ’s banner. They consider “Reputent,” let them consider. with themselves what dangers hang over their heads, to the end they may be the more ready to enter “Obcundis,” to obviate or face them. the same, although they see their enemies press sore upon them; yet lest it should grieve them “Ne pigeat,” let it not grieve them. to have a new combat ever now and then, they assure “Confidant,” let them confide. themselves that they shall be invincible “Semper inexpugnabiles,” always invincible. through the same power of God whereby they got the victory before. And it is to be thought (although Luke makes no mention thereof) that the apostles being contented with their former answer, did not contend with those furies, [furious men;] and yet we must persuade ourselves that they were not so forgetful of their former constancy that they did submit themselves unto their ungodly decree like slaves. “Ut serviliter excipient,” as servilely to submit.

Acts 4:24-31

24. And when they had heard it, they lifted up their voice unto God with one accord, and said, Lord,, thou art God, which hast made heaven and earth, the sea, and all things which are therein; 25. Which by the mouth of thy servant David hast said, Why have the heathen raged together, and why have the people imagined vain things? 26. The kings of the earth have stood up, and the rulers have met together against the Lord, and against his Christ. 27. For of a truth, Herod and Pontius Pilate, with the Gentiles, and the people of Israel, have come together in this city against thy holy Son, Jesus, 28. That they might do whatsoever thine hand and thy counsel had decreed before to be done. 29. And now, O Lord, look upon the threatenings of these men; and grant unto thy servants that they may speak thy word with boldness; 30. Reaching out thine hand to this end, that healing, and signs, and wonders, may be done by the name of thy only Son, Jesus. 31. And when they had prayed, the place moved wherein they were assembled: and they were all filled with the Holy Ghost, and did speak the word of God with boldness.