Why does Les want viewers to keep Paul's points in their memory?
He wants believers to retain Paul's points so that when they return to the Gospels, they will recognize that these revelations are not found there. This comparison shows Paul's epistles contain truths absent from the Old Testament, Christ's earthly ministry, and the early book of Acts.
Les teaches that he is taking points Paul brings out in his epistles and wants viewers to keep them in their memory bank. The reason is so that when they go back to the Gospels, they will realize that none of this is back there. He clarifies that this does not mean throwing the rest of the Bible away in order to study Paul, but it does mean understanding that many things Paul brings out in his letters are not found in the Old Testament, in Christ's earthly ministry, or in the early book of Acts. He urges constant reminding and comparison, beginning with I Corinthians chapter 15, the first four verses.