Paul, in recounting his life, and his conversion from Judaism to Christianity, said that all of it was by grace. He was called even before he was born by God’s marvelous grace.
“15 But even before I was born, God chose me and called me by his marvelous grace. Then it pleased him 16 to reveal his Son to me so that I would proclaim the Good News about Jesus to the Gentiles” (Galatians 1:15-16 NLT).
Look what Paul said in Romans “Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified” (Romans 8:30).
This is all what God has done. He is the one who calls. He is the one who justifies. All this is because God sent His Son to die on the cross for each of us. The call has gone out to everyone. Whoever answers the call will be saved. This is the Lord’s doing and it is marvelous in our sight.