Saul will take the name Paul when he begins to evangelize the Gentiles. He would write the profound and powerful book of Romans in which he says, "Where sin increased, grace abounded all the more" (Romans 5:20). He would also speak about the grace of God in connection with offerings made by other believers in 2 Corinthians 8 and 9.
Paul knew all about grace. He recognized that he needed it most of all. We should aspire to know all about grace as well. We need it. And so do our loved ones, neighbors, and even our enemies.