1 John
Most people in our world today see things in shades of gray. Some things are mostly right or kinda right or not really very wrong. The book of 1 John sees things in black and white. There is truth and there is error. There is salvation and there is damnation. There is light and there is darkness. This letter helps the readers to distinguish between what is good and what is evil.
2 John
This short letter was written to a woman to warn her against false teachers. One of the things that she should do when a false teacher comes is refuse to give him a room to sleep in. In those days when there weren’t hotels, the false teacher would have to travel on to another city and probably he wouldn’t come back.
3 John
This letter is something of the flip side of 2 John. Here he says that they should show hospitality to those who are doing God’s work. He includes some other helpful advice also.