Who was chosen to receive and reveal the mysteries to the Gentiles?
The Apostle Paul, a Jew and Pharisee of the tribe of Benjamin, was the one chosen to receive these mysteries and secrets. God revealed them to him after Israel rejected Christ, so that he could take them to the Gentile world and reveal them.
Les explains that God can keep things secret as long as He cares to, and this whole body of revealed truth was one of those secrets. He did not reveal it, not even a hint of the church age or the rapture, in the Old Testament prophecies or Christ's earthly ministry. The Old Testament was based on the prophetic Word and the Abrahamic covenant, and Christ came in fulfillment of that covenant to Israel as Messiah and King. But Israel rejected Him. So God turned to the rest of the world by putting Israel into dispersion and not using the Jew, except for this one man, the Apostle Paul, who was a Jew, a Pharisee of the Pharisees of the tribe of Benjamin. To this Jew the mysteries were revealed, so he could take them out to the Gentile world and reveal them. Les also notes the timeline starting with Adam, then Abraham's call in 2000 B.C., which brought about the nation of Israel, pulled from the main river of humanity.