Is Paul's defense of his apostolic authority still relevant today?
Yes. The defense of Paul's apostolic authority remains relevant today because the whole theme is that Paul was defending his authority as an apostle, and it is just as appropriate today as it was in that time. This ongoing appropriateness means the defense still applies now.
Les teaches from 2 Corinthians chapter 10, picking up at verse 12 and moving into chapter 11. He explains that the whole theme in this section is that the Apostle Paul is still defending his authority as an apostle. Les then applies it by saying this defense is just as appropriate today as it was in that time. So the relevance is not limited to the first-century setting; the same apostolic defense continues to be appropriate for today.