I don't tend to reread many books in general. C.S. Lewis and Tolkien's fictional series are probably the only exceptions. However, I do frequently reread books from the Bible, typically the English Standard Version. And yes, I would make the claim that all of these are non-fictional books/letters.
- Jonah: for its description of God's desire to have compassion on a group of people who don't know him, by leaving Jonah with no other option than telling those people about Him.
- Ecclesiastes: For "The Teacher's" many vignettes about how life is a quickly-dissipating vapor, and his pointing to ways to find satisfaction in it.
- Mark: Mark tells the story of Jesus' life and ministry in a no-nonsense, get-to-the-point kind of way.
- Romans: Paul gives a treatise on: the main problem of mankind, the inability of men to live up to any standard of behavior, the source of any confidence that anyone can have that God might be pleased with them, the way the Christian church relates to the people of Israel, and how to live in unity with people with whom you have disagreements.
- 1 John: John never got over the fact that he was loved by Jesus, and this letter is his recapitulation of that same love toward others.
- Jonah: for its description of God's desire to have compassion on a group of people who don't know him, by leaving Jonah with no other option than telling those people about Him.
- Ecclesiastes: For "The Teacher's" many vignettes about how life is a quickly-dissipating vapor, and his pointing to ways to find satisfaction in it.
- Mark: Mark tells the story of Jesus' life and ministry in a no-nonsense, get-to-the-point kind of way.
- Romans: Paul gives a treatise on: the main problem of mankind, the inability of men to live up to any standard of behavior, the source of any confidence that anyone can have that God might be pleased with them, the way the Christian church relates to the people of Israel, and how to live in unity with people with whom you have disagreements.
- 1 John: John never got over the fact that he was loved by Jesus, and this letter is his recapitulation of that same love toward others.
[Jonah]: https://www.biblegateway.com/passage/?search=Jonah%201&versi...
[Ecclesiastes]: https://www.biblegateway.com/passage/?search=Ecclesiastes+1&...
[Mark]: https://www.biblegateway.com/passage/?search=Mark+1&version=...
[Romans]: https://www.biblegateway.com/passage/?search=Romans+1&versio...
[1 John]: https://www.biblegateway.com/passage/?search=1+John+1&versio...