Why can God now pour out the whole package of revealed truth on the human race?
Because the price of redemption has been paid, the work of the cross is finished, and the power of His resurrection is accomplished, God can now pour out the whole package of revealed truth on the human race. This truth, once kept secret in God's mind, is revealed through Paul's epistles for the Church.
Les teaches that the secret was kept secret since before anything was created, so Jesus could not preach it and Peter could not preach it; it remained totally secret in the mind of God. But because the price of redemption was accomplished, the work of the cross was done, and because of the power of His resurrection, God can now pour out on the human race the whole package of revealed truth. That package comes from the pen of the Apostle Paul and contains all the truth the Church needs today. The rest of the Bible is not to be thrown away, since all the Bible works toward its common end. Les says Christendom would see things begin to happen if it spent 90% of its time in Paul's epistles and 10% in the rest of the Bible, instead of the other way around.