In Jude, we see the need to contend for the faith once delivered to the Saints
Through the example of three men, we see in 3 John what it means to be a true follower of the Lord.
In 2 John, we learn that true love means walking in obedience to God's Commands.
In Philemon, we learn what it means to forgive each other in light of the fact that Christ has forgiven us.