A Vicious Persecutor Becomes a Zealous Witness

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An Exposition of Acts 9:15, 16, 20–22

The conversion of Saul of Tarsus stands as one of the most remarkable and theologically significant transformations in Scripture. A man who once persecuted the early Christian congregation with relentless fury became one of its most passionate and effective witnesses. This event, chronicled in Acts 9, is not only a powerful testimony of divine grace but also a profound illustration of God’s sovereign purpose in choosing vessels for His work.

Acts 9:15–16 (UASV)
15 But the Lord said to him, “Go, for he is a chosen instrument of mine to bear my name before the Gentiles and kings and the sons of Israel; 16 for I will show him how many things he must suffer for my name’s sake.”

Following Saul’s encounter with the risen Christ on the road to Damascus (Acts 9:1–9), the Lord appeared in a vision to a disciple named Ananias, instructing him to go to Saul. Ananias hesitated, knowing Saul’s reputation for persecuting believers. Yet the Lord revealed Saul’s divine appointment—“a chosen instrument”—who would bear His name far and wide.

Key Insight: The phrase “chosen instrument” (Gr. σκεῦος ἐκλογῆς, skeuos eklogēs) emphasizes divine initiative. Saul’s calling was not based on merit but on God’s sovereign will. Despite his violent past, God purposed to transform him into an apostolic witness who would declare the Gospel to Gentiles, kings, and the sons of Israel—a mission of extraordinary breadth.

Lesson: God’s grace can reach the vilest of sinners and employ them for His greatest purposes. No past is too corrupt for redemption if God has chosen to extend mercy and call the individual into His service. Paul later reflected on this truth, writing, “Christ Jesus came into the world to save sinners, of whom I am the foremost” (1 Timothy 1:15).

Verse 16 introduces a sobering reality—Paul’s apostleship would entail great suffering. The Lord would show him how many things he must suffer for the sake of Christ’s name. Indeed, Paul’s ministry was marked by beatings, imprisonment, stoning, shipwreck, and relentless opposition (cf. 2 Corinthians 11:23–27).

Lesson: Divine calling does not guarantee ease. On the contrary, those entrusted with the weightiest missions often bear the heaviest crosses. Yet such suffering is never purposeless—it aligns the servant with Christ and magnifies God’s power in weakness (2 Corinthians 12:9–10).

Acts 9:20–22 (UASV)
20 And immediately he began to proclaim Jesus in the synagogues, saying, “He is the Son of God.” 21 And all those hearing him continued to be amazed and were saying, “Is this not the one who in Jerusalem destroyed those who called on this name and who had come here for the purpose of bringing them bound before the chief priests?” 22 But Saul kept increasing in strength and was confounding the Jews who lived in Damascus by proving that this one is the Christ.

Following his baptism and physical healing (Acts 9:17–18), Saul did not retreat to anonymity or hesitation. “Immediately he began to proclaim Jesus in the synagogues.” This rapid transition from persecutor to preacher emphasizes the depth of his conviction and the clarity of his encounter with the risen Christ.

Key Insight: His proclamation—“He is the Son of God”—was a radical confession, particularly within the synagogues of Damascus. This title affirms not only Jesus’ unique relationship with God but His divine authority and messianic identity. For a Pharisee trained under Gamaliel (Acts 22:3), this statement signaled a seismic theological shift.

Verse 21 captures the astonishment of Saul’s audience. They could not reconcile his prior identity as a militant enemy of the faith with his new role as a fervent preacher of it. Their question—“Is this not the one…?”—exposes the dissonance between Saul’s former purpose and his new direction. His transformation defied all natural explanation, pointing unmistakably to divine intervention.

Verse 22 affirms that Saul’s preaching was not only bold but effective: “Saul kept increasing in strength and was confounding the Jews.” The Greek word translated “confounding” (συνέχυννεν, synechynnen) means to throw into confusion or to baffle. Saul’s mastery of the Scriptures and ability to “prove that this one is the Christ” disarmed his opponents.

Lesson: A true conversion results in a transformed mission. Paul did not merely change his beliefs—he redirected his entire life toward declaring Christ. His knowledge of the Hebrew Scriptures, once used to persecute, now served to prove that Jesus is the promised Messiah.

Summary and Application

The account of Saul’s conversion and early ministry demonstrates critical theological and practical truths:

1. God’s Grace Can Redeem the Worst Sinners
Saul was a “vicious persecutor,” approving of Stephen’s death (Acts 8:1), dragging off Christians to prison (Acts 8:3), and seeking their destruction (Acts 9:1–2). Yet God chose him to be His witness. This proves that no one is beyond the reach of God’s mercy.

2. Divine Calling Involves Sacrifice
From the outset, Saul was informed that suffering would mark his path. His apostleship was not a mark of comfort but of commission—a life laid down for the name of Christ.

3. The Gospel Transforms Minds and Missions
Paul’s immediate shift to proclaiming the Gospel reflects the transformative power of truth. Conversion is not mere assent—it is a reorientation of life, purpose, and allegiance.

4. Evangelistic Boldness Comes from Theological Clarity
Saul’s ability to confound the Jews in Damascus came from his deep grounding in Scripture. He preached not emotion but evidence, offering reasoned arguments that Jesus fulfilled messianic prophecy.

5. The World Will Be Amazed at Real Conversion
The amazement of those who heard Paul illustrates the testimony that a radically changed life provides. A former persecutor turned proclaimer is undeniable evidence of God’s work.

Conclusion

Paul’s life bears witness to the unsearchable riches of God’s grace and the transforming power of the Gospel. From a murderous opponent of the faith, he became its greatest advocate and defender. This radical change was not by human effort but by divine encounter and calling. His early ministry, filled with bold proclamation and growing strength, provides a pattern for every believer: to preach Christ crucified, to prove the truth from Scripture, and to suffer willingly for His name.

About the Author

EDWARD D. ANDREWS (AS in Criminal Justice, BS in Religion, MA in Biblical Studies, and MDiv in Theology) is CEO and President of Christian Publishing House. He has authored over 220+ books. In addition, Andrews is the Chief Translator of the Updated American Standard Version (UASV).