Very useful. C.S. Lewis identified his gifts and talents and used them for the glory of God. The lecture deals also with Lewis' love and patience to answer many-many letters, his love for souls, for the church, his life of prayer, his excellency in the Academic world.
Hard to find good, sound material on angels This study of angels is outstanding - doctrinally sound and based in the Bible. The angel has sort of been co-opted by the New Age and fringe movements in Christianity, and it's hard to find much trustworthy, Biblically based material about angels. I recommend this series to anyone wanting to know not what other people have said, but what the Bible says, about angels.