Where are Paul's revealed truths not found in the Bible?
They are not found in the Old Testament, in Christ's earthly ministry, or in Peter's activity in the Book of Acts. They are a whole new revelation, the mystery kept secret since the world began and never prophesied, though built on what went before.
Les teaches that the Holy Spirit revealed to Paul doctrines and truths no one else ever dreamed would happen. These are not in the Old Testament, not in Christ's ministry, and not in Peter's activity in the Book of Acts, but are a whole new revelation. Romans 16:25 calls it the revealing of the mystery kept secret since the world began. It was never prophesied, yet it builds on everything that went before, which is why Les teaches the Old Testament and Gospels alongside the Pauline letters.