Dear Brothers and Sisters in Christ,
On the subject of the OOL, I can highly recommend all of the books, but the volumes of St. Cyril are wonderful ones to have, not least since they are to all intents and purposes unavailable in book form elsewhere.
I am looking forward to the next set of volumes.
In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. (1 John 4:10)