By St. Athanasius. This is another very important book. St. Athanasius articulated and defended the apostolic understanding of the incarnation against Arius, the pen-ultimate heretic. It is a deeply profound and moving book. The incarnation is the central truth of classical Christianity. The introduction by C.S. Lewis is worth the price of the book.
Please note: I reserve the right to delete comments that are snarky, offensive, or off-topic. If in doubt, read My Comments Policy.