Acts 9:21

"And all that heard him were amazed, and said, Is not this he that in Jerusalem made havoc of them that called on this name? and he had come hither for this intent, that he might bring them bound before the chief priests. But Saul increased the more in strength, and confounded the Jews that dwelt at Damascus, proving that this is the Christ"Increased more in strength" McGarvey feels that this increase refers to the physical strength mentioned in Acts 9:19, but it seems that it refers to strength in knowledge. When Saul first preached, he encountered amazement, but as he continued to preach much of that amazement turned to opposition. This would infer that as he met various arguments, the guidance from the Holy Spirit enabled him to better his opponents. As opposition increased, so did his responses. "Confounded" His opponents were unable to answer his arguments (Acts 6:10). "Proving" "The verb means to bring or put together: hence to compare and examine, as evidence, and so to prove" (Vincent p. 493). He could do this by comparing the messages of the prophets with the life of Jesus (Acts 17:1). Note: God knows that it can be "proven" that Jesus is the Son of God. One does not have to cross their fingers to believe that Jesus is the Messiah, therefore definite evidence must exist which will convince the common man who is honest.