Why did Les decide to take the audience to Paul's letters before beginning the book of John?

The teacher planned to digress from the Gospels, go to John next, then finish Matthew's post-resurrection forty days. But before starting John, he wanted to take the studio and television audience back to Paul's letters because he had probably shaken a few people up.

Les explains that he was going to digress from the study in the Gospels for the next half hour. He was probably going to go to the book of John next, and then go back and finish what was left off in Matthew—the post-resurrection 40 days still to be covered. But before starting John, he wanted to take the studio audience and television audience back to the letters of Paul, because he had probably shaken a few people up.

Why is Les taking viewers to Paul's letters before he starts the Gospel of John?

The teacher returns to Paul’s letters before beginning John because he had probably unsettled some listeners and wanted to address that first. He says this is a digression from the Gospels before the planned John study, after which he will finish Matthew’s remaining post-resurrection forty days.