And suddenly - While they were praying and singing.

A great earthquake - Matthew 28:2. An earthquake, in such circumstances, was regarded as a symbol of the presence of God, and as an answer to prayer. See the notes on Acts 4:31. The design of this was, doubtless, to furnish them proof of the presence and protection of God, and to provide a way for them to escape. It was one among the series of wonders by which the gospel was established, and the early Christians protected amidst their dangers.

And immediately all the doors were opened - An effect that would naturally follow from the violent concussion of the earthquake. Compare Acts 5:19.

Everyone's bands were loosed - This was evidently a miracle. Some have supposed that their chains were dissolved by electric fluid; but the narrative gives no account of any such fluid, even supposing such an effect to be possible. It was evidently a direct interposition of divine power. But for what purpose it was done is not recorded. Grotius supposes that it was that they might know that the apostles might be useful to them and to others, and that by them their spiritual bonds might be loosed. Probably the design was to impress all the prisoners with the conviction of the presence and power of God, and thus to prepare them to receive the message of life from the lips of his servants Paul and Silas. They had just before heard them singing and praying; they were aware, doubtless, of the cause for which they were imprisoned; they saw evident tokens that they were the servants of the Most High, and under his protection; and their own minds were impressed and awed by the terrors of the earthquake, and by the fact of their own liberation. It renders this scene the more remarkable, that though the doors were opened, and the prisoners loosed, yet no one made any attempt to escape.

There was a great earthquake - Thus God bore a miraculous testimony of approbation to his servants; and, by the earthquake, and loosing the bonds of the prisoners, showed, in a symbolical way, the nature of that religion which they preached: while it shakes and terrifies the guilty, it proclaims deliverance to the captives, and the opening of the prison-doors to them that are bound; and sets at liberty them that are bruised.

Every one's bands were loosed - And yet so eminently did God's providence conduct every thing, that not one of the prisoners made his escape, though the doors were open, and his bolts off!

And suddenly there was a great earthquake,.... An extraordinary and unusual one; which did not arise from natural causes, from wind being pent up in the earth, but from the prayers and praises of the saints, going up to heaven; when God was pleased to testify his presence and power this way; and the effects which followed upon this earthquake, show it to be a supernatural one:

so that the foundations of the prison were shaken; not the roof and walls only, as is common in earthquakes, but the very foundation also; and yet the edifice was not thrown down, as is usual when the foundation is shaken:

and immediately all the doors were opened; both of the outer and inner prisons, which is another unusual effect of earthquakes:

and everyone's bands were loosed; not only the bands of Paul and Silas, but of the rest of the prisoners; though the Arabic version reads, "all the fetters and bands of both were loosed", referring it only to Paul and Silas; this circumstance shows also, that the earthquake was miraculous, for when was it ever known that such an effect ever followed one?

And suddenly there was a great earthquake, so that the foundations of the prison were shaken: and immediately all the doors were opened, and every one's bands were loosed.

16:26 There was a great earthquake. God heard them, too. See Ac 4:31. It was God's angel to loose their bonds, open the prison doors, and magnify their work.

26-28. And suddenly there was a great earthquake-in answer, doubtless, to the prayers and expectations of the sufferers that, for the truth's sake and the honor of their Lord, some interposition would take place.

every one's bands-that is, the bands of all the prisoners.

were loosed-not by the earthquake, of course, but by a miraculous energy accompanying it. By this and the joyous strains which they had heard from the sufferers, not to speak of the change wrought on the jailer, these prisoners could hardly fail to have their hearts in some measure opened to the truth; and this part of the narrative seems the result of information afterwards communicated by one or more of these men.

16:25-34 The consolations of God to his suffering servants are neither few nor small. How much more happy are true Christians than their prosperous enemies! As in the dark, so out of the depths, we may cry unto God. No place, no time is amiss for prayer, if the heart be lifted up to God. No trouble, however grievous, should hinder us from praise. Christianity proves itself to be of God, in that it obliges us to be just to our own lives. Paul cried aloud to make the jailer hear, and to make him heed, saying, Do thyself no harm. All the cautions of the word of God against sin, and all appearances of it, and approaches to it, have this tendency. Man, woman, do not ruin thyself; hurt not thyself, and then none else can hurt thee; do not sin, for nothing but that can hurt thee. Even as to the body, we are cautioned against the sins which do harm to that. Converting grace changes people's language of and to good people and good ministers. How serious the jailer's inquiry! His salvation becomes his great concern; that lies nearest his heart, which before was furthest from his thoughts. It is his own precious soul that he is concerned about. Those who are thoroughly convinced of sin, and truly concerned about their salvation, will give themselves up to Christ. Here is the sum of the whole gospel, the covenant of grace in a few words; Believe in the Lord Jesus Christ, and thou shalt be saved, and thy house. The Lord so blessed the word, that the jailer was at once softened and humbled. He treated them with kindness and compassion, and, professing faith in Christ, was baptized in that name, with his family. The Spirit of grace worked such a strong faith in them, as did away further doubt; and Paul and Silas knew by the Spirit, that a work of God was wrought in them. When sinners are thus converted, they will love and honour those whom they before despised and hated, and will seek to lessen the suffering they before desired to increase. When the fruits of faith begin to appear, terrors will be followed by confidence and joy in God.