Acts 13:48 ESV 48And when the Gentiles heard this, they began rejoicing and glorifying the word of the Lord, and as many as were appointed to eternal life believed. What does this pasage teach us? What sticks out to me is the last part, "and as many as were appointed to eternal life believed." I believe this passage clearly shows that God elects people to salvation and those elect people believe as a result of that election. So it is not their belief that caused their election to eternal life but their election to eternal life that caused their belief.