In What Is God?, Kevin Vost (Memorize the Reasons!) shows you how you can better know the most worthy object of our love, following the thought of the great theologian who first asked that question as a young boy: St. Thomas Aquinas. That thirteenth-century Dominican friar later devoted much of his masterwork, the Summa Theologica, to exploring God in his deepest essence. But if you don't have time to read a 1.8-million-word philosophical treatise...