What exactly is the mystery God kept hidden?
The mystery hidden in God since the beginning of the age is the revealed truth given through Paul: redemption by Christ's atoning blood, justification, forgiveness, the indwelling Holy Spirit, baptism into the Body of Christ, and the sudden out-calling of all believers as members of that Body.
Les teaches that this mystery was hid in God since the beginning of the age, using the same word found in Deuteronomy 29. It is the whole package of revealed truth that now comes from Paul's pen. Les explains that it includes redemption through Christ's atoning blood, justification, forgiveness, the indwelling Holy Spirit, and baptism by the Holy Spirit into the Body of Christ. He points out that the term "Body of Christ" is not found anywhere in Scripture except in Paul's writings. Every believer, whether black or white, rich or poor, east or west, becomes a member of this Body. Les calls it a revelation of a mystery, a sudden out-calling never mooted before, and notes that many people are sending him articles and booklets about the Church going into or through the Tribulation.
Unto me, who am less than the least of all saints, is this grace given, that I should preach among the Gentiles the unsearchable riches of Christ;
See the restWho did God finally reveal the secrets He had kept hidden in His mind?
God finally revealed the secrets He had kept hidden in His mind to Paul. The context speaks of Paul’s epistles being treated like an unlovely stepchild, then says it was to this man that the secrets held in the mind of God were finally revealed. Ephesians 3:8–9 is the cited passage.
Who was the mystery revealed to, and why?
The mystery was revealed to the Apostle Paul, described as the least of all saints. It was revealed so that all men might see the fellowship of the secret, which had been hidden in God from the beginning of the age and was not made known before.