An early apologetic on the divinity of Christ, written in the 4th century by St. Athanasius around the time of the Arian controversy. My favorite section in this book was the refutation of the Jews and the Gentiles (the part labeled "skip if you want" -- don't skip it!), as it sheds some light on early objections to Christianity - some which are the same as today, some which are no longer raised. It helped me see the continuing relevance of Christ, from the 4th century (and before) until now. Every age finds meaning and truth in the same Jesus. I also enjoyed the introduction by C.S. Lewis almost as much as the book itself. Lewis exhorts us to read "old books" as well as new (modern) ones. "It is a good rule, after reading a new book, never to allow yourself another new one till you have read an old book in between. If that is too much for you, you should at least read one old one to every three new ones." Good rule, Lewis. I'll try to follow that - and by the way, does your writing count as "old"??