Athanasius on "The Incarnation of the Word" with introduction by C.S.Lewis

http://www.spurgeon.org/~phil/history/ath-inc.htm

When I took a particular course in religion at Concordia, the instructor recommended this treatise for further reading.  I got around to it eventually, but this was some time ago.  It's time to look at it again.

The introduction by C.S. Lewis is worthy reading all on its own, too.