[katana]

Mere Christianity by C.S. Lewis. Especially for a younger reader (and especially if you are or think of yourself as a Christian).

[BenKenobi]

In a list of overall books, yes. In with non-fiction? I’d have to think about that. I love, love the book, but I’m not sure this is what he’s looking for.

Confession has St. Augustine’s personal testimony, and Aquinas has quite a bit of natural law, which people need to know and understand.