Paul persecuted the church of God and tried to destroy it.  But God revealed his son Jesus in him… and called him to be the foremost apostle to the Gentiles.  No past is irredeemable… with God, the future is far beyond what you could ever dream.

They only heard the report: “The man who formerly persecuted us is now preaching the faith he once tried to destroy.”

-GALATIANS 1:23