The second is St. Thomas Aquinas: The Dumb Ox, of which the great Thomist scholar Ettienne Gilson said: "I consider it as being without possible comparison the best book ever written on St. Thomas. Nothing short of genius can account for such an achievement.... Chesterton was one of the deepest thinkers who ever existed; he was deep because he was right; and he could not help being right; but he could not either help being modest and charitable, so he left it to those who could understand him to know that he was right, and deep." A good introduction, even for those who are intimidated by the writings of the great Saint himself.