The philosophical theology of St. Thomas Aquinas is the crowning piece of his metaphysics. Leo J. Elders studies it against the background of the attempts of the great philoso- phers of the past to penetrate deeper into the knowledge of God. While the Introduction treats the nature of philosophical theology according to Aquinas, Chapter One presents a concise history of the idea of God in Western philosophical thinking. Chapters Two and Three deal with the question of the cognoscibility of God and the Five Ways of St. Thomas. New solutions are proposed of some difficulties in the Third and Fourth Ways. The attributes of God are studied in the order of the Summa theologiae I . Chapter Seven considers the grammar of God-language. The following chapters examine divine knowledge, foreknowledge of future events, divine will and providence as well as creation. The last chapter deals with the problem of the co-existence of God and finite creatures. This study shows that the philosophical theology of St. Thomas Aquinas is a coherent whole of impressive depth and beauty. It has its basis in our daily experience of the world and the general principles of being, but its conclusions reach the summits of negative theology.