Saul was highly trained in the Old Testament scriptures. By revelation from the Spirit, he immediately connected the dots between Bible prophecies and Jesus. He showed how Jesus fulfilled messianic promises through his life, death, and resurrection. He was able to reasonably prove that Jesus was (and is) the Jewish Messiah.
Saul’s preaching became more and more powerful, and the Jews in Damascus couldn’t refute his proofs that Jesus was indeed the Messiah. Acts 9:22 (NLT)
Many, if not most, believers today feel woefully inadequate to this task, but the remedy is fairly easy. With some study and practice, we too can use Old Covenant scriptures to show how Jesus is the Savior and Lord promised to Eve, Abraham, Moses, David, Isaiah, Jeremiah, and Daniel, to name a few key players.
We should not take the “easy way out” by only learning and sharing our testimonies or an overly simplified “plan of salvation.” The amazingly powerful gospel is not too hard for us to master. But we have to choose to do it.
It is important for us to remember that the gospel is powerful when it is rightly shared.
For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes, to the Jew first and also to the Greek. 17 For in it the righteousness of God is revealed from faith to faith; as it is written, “BUT THE RIGHTEOUS man SHALL LIVE BY FAITH.” Romans 1:16–17 (NASB95)