The place was shaken; miraculously moved up and down, as on the waves of the sea, to evidence God's presence with them, and acceptance of them and their prayers in an extraordinary manner. They were all filled with the Holy Ghost; according to their conditions, whether apostles (for whom these prayers were especially made) or private believers. They spake the word of God with boldness: this was the grace they asked, Acts 4:29. God gave it them, and with it all other graces necessary for them. In their difficulties and wants, the greatest and holiest in the church of God must go to God to be supplied, and prayer is the most successful means.
Related Commentaries of Acts 4:31
Acts 4:31
31 And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness.