1 Corinthians 15:9-11

Yes, I am the most insignificant of all the apostles, unworthy even to be called an apostle, because I hunted down believers and persecuted God’s church. But God’s amazing grace has made me who I am! And his grace to me was not fruitless. In fact, I worked harder than all the rest, yet not in my own strength but God’s, for his empowering grace is poured out upon me. So this is what we all have taught you, and whether it was through me or someone else, you have now believed the gospel.