Note the progression and power of words in Acts. The first example of this movement of words comes in Acts 2. Peter, being filled with the Spirit, stands up and speaks:
First, Peter calls the crowd to listen to the words:
But Peter, standing with the eleven, lifted up his voice and addressed them: “Men of Judea and all who dwell in Jerusalem, let this be known to you, and give ear to my words…. Acts 2:14
This sounds very similar to the pleas in each of the introductory poems of Proverbs 1-9, where the father and Lady Wisdom both call out to be heard. Thus, in Acts 2:1-5, giving ear to the words leads to the fear of the Lord.
The importance of Peter’s plea is seen by his repetition of the command, the plea to hear the words:
“Men of Israel, hear these words: Jesus of Nazareth, a man attested to you by God with mighty works and wonders and signs that God did through him in your midst, as you yourselves know— Acts 2:22
The plea comes at the beginning of this sermon and then again when he comes to the key point: The Spirit has come because of the work of Christ.
Even when the sermon ends, Peter does end the giving of words to the people:
And with many other words he bore witness and continued to exhort them, saying, “Save yourselves from this crooked generation.” Acts 2:40
We must realize that these words have their origin with the work of the Holy Spirit. First, the Spirit begins by causing all the believers present to prophecy in other tongues (Acts2:5). Peter himself speaks to explain what the Spirit has done. Third, Peter testifies in his first epistle that such preaching has its origin in the work of the Spirit:
10 Concerning this salvation, the prophets who prophesied about the grace that was to be yours searched and inquired carefully, 11 inquiring what person or time the Spirit of Christ in them was indicating when he predicted the sufferings of Christ and the subsequent glories. 12 It was revealed to them that they were serving not themselves but you, in the things that have now been announced to you through those who preached the good news to you by the Holy Spirit sent from heaven, things into which angels long to look. 1 Peter 1:10–12 (ESV)
And what is the effect of the word?
So those who received his word were baptized, and there were added that day about three thousand souls. Acts 2:41
Those who receive the words transformed, born again, saved:
22 Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart, 23 since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God; 24 for “All flesh is like grass and all its glory like the flower of grass. The grass withers, and the flower falls, 25 but the word of the Lord remains forever.” And this word is the good news that was preached to you. 1 Peter 1:22–25 (ESV)