Paul testifies of God’s message to him. God says to Paul, “I send you to open their eyes and turn them from darkness to light, from the dominion of Satan to God, so that, by trust in Me, they may obtain forgiveness of sins, and a place with those whom God has made His own.” From the mouth of God, His own Word succinctly states the good news — the gospel.
Notice God creates a place for His own. Notice God calls His own by sending someone — a specifically selected someone — “to open their eyes and turn them from darkness to light.” Notice God makes people His own, saying: “By trust in Me, they obtain forgiveness of sins.”
Jesus says, “I Am the vine, and you are the branches. He who dwells in Me, as I dwell in Him, bears much fruit; for apart from Me you can do nothing.” (John 15:5)
Those seven words [in the English translation, anyway] hold the essence of our reliance upon God. “Apart from Me you can do nothing,” says Jesus. “Nothing.” Even our trust in God comes from God, as a gift. The news is good — God saves us of His own free will.