In the Biblical Insight Commentary, volume 11, on Second Corinthians, is a short study that was presented at the Senior Adult Luncheon and Rally at the Southland Baptist Church in San Angelo, Texas, on March 11, 2016. Listed in this web page under 2 Cor. 4:16-18 are three pdf files:
These files contain 1) the background exegesis of the passage; 2) the slides from the power point presentation to the group; and 3) a one page handout given to those present. If you would like to have the presentation file, send me an email at firstname.lastname@example.org, and I will send it to you via email attachment.
This passage is very interesting due both to its content and also for the important role it plays in Paul's defense of his ministry to the Corinthians in these early chapters of Second Corinthians. It stands as a rich reminder on how to avoid burn out in ministry, along with how to remain consistently faithful over a life time of devotion to Christ.