Paul was being used by God even from the start of his life. He was a well-educated Pharisee so he knew the law well and knew how to make an argument (evidence, debatable claim, commentary). He was also a tentmaker so as not to be a burden to the churches where he was being a missionary. Like Paul, I feel as though God might be molding me into the kind of person he wants me to be. When my family started to get sick, I saw how the doctors gave us hope and were used by God to answer prayer. Having been through that, I might want to be a doctor someday.