In answer to their prayer and in fulfillment of his promise (Lk 11:13), the place is shaken, and all—not just the apostles—are filled with the Holy Spirit (2:4; 4:8, see comment). They speak (literally, were speaking—continuous action at intervals) the word of God (God's great good news of salvation; 11:19; 13:46; 14:25) with boldness. The messengers are unstoppable. The mission continues with divine momentum. As Chrysostom observed about the place being shaken: "and that made them the more unshaken" (Homily on the Acts of the Apostles 11).