about prudence, which is so necessary in order to discriminate between truth and error (1 Thessalonians 5:21) and to guard against false teachers (Psalm 17:4; 1 John 4:1). It is especially the young who are directed to this book, as their undisciplined ardor is wasted, and their minds are at the mercy of the opinions of the world all around them. They are in great need of some settled guiding principles for their lives. Here they find knowledge and discretion, which is a religion not of imagination,