12 Thinking about that, he came to the house of Mary, the mother of John whose surname was Mark, where many were gathered together and were praying. 13 When Peter knocked at the door of the gate, a maid named Rhoda came to answer. 14 When she recognized Peter’s voice, she didn’t open the gate for joy, but ran in, and reported that Peter was standing in front of the gate. 15 They said to her, “You are crazy!” But she insisted that it was so. They said, “It is his angel.” 16 But Peter continued knocking. When they had opened, they saw him, and were amazed.
Matthew Henry's Commentary on Acts 12:12-16
Commentary on Acts 12:12-19
(Read Acts 12:12-19)
God's providence leaves room for the use of our prudence, though he has undertaken to perform and perfect what he has begun. These Christians continued in prayer for Peter, for they were truly in earnest. Thus men ought always to pray, and not to faint. As long as we are kept waiting for a mercy, we must continue praying for it. But sometimes that which we most earnestly wish for, we are most backward to believe. The Christian law of self-denial and of suffering for Christ, has not done away the natural law of caring for our own safety by lawful means. In times of public danger, all believers have God for their hiding-place; which is so secret, that the world cannot find them. Also, the instruments of persecution are themselves exposed to danger; the wrath of God hangs over all that engage in this hateful work. And the range of persecutors often vents itself on all in its way.