Chs. 17-19: Threefold division of the various kinds of speech. The Christian orator is constantly dealing with great matters. The Christian teacher must use different styles on different occasions.
Chs. 19-24: 2 kinds of heathen knowledge. Superstitious human institutions. Superstition of astrology. Folly of observing stars to predict lives. Why we repudiate divination. Demons and superstitious