Mortimer Adler has always been ahead of his time. In 1982, before the current revival of interest in angels, Dr. Adler published "The Angels and Us," an engaging look at the various images and hierarchies of angels (including guardian angels). Dr. Adler, the bestselling author of "Ten Philosophical Mistakes," "Aristotle for Everybody," and "The Great Ideas," speculates on the existence of angels; why Jews, Christians, and Muslims believe in angels, and the ways angels have been viewed as objects of religious belief and philosophical thought. This is a wonderfully enlightening work on the affinities between angels and human beings.