How and where did Paul receive the unique truths he wrote in the Bible?

Les explains that Paul was commissioned right at his conversion at Damascus, when God told Ananias He would send him far hence to the Gentiles. Then God took him out into the desert and gave him His revelations. Paul refers to this in Galatians chapter 1, how by revelation God made known unto him all these things that would come from his pen and that you won't find anywhere else in the whole Bible. Les notes that Paul also says all Scripture is inspired of God, cover to cover, and profitable. Paul never lifts himself up as the only one to pay attention to, but he brings out many doctrines unique to Scripture, so Les encourages spending the best part of our time in Paul's epistles and funneling back and forth throughout all the rest of the Scriptures.