John the Evangelist is called by the Fathers “the theologian,” because he most fully treats of the internal relations of the persons of the Trinity. Gregory Nazianzen (328) received this designation because he defended the deity of Christ against the Arians. For a modern instance of this use of the term “theology” in the narrow sense, see the title of Dr. Hodge’s first volume: “Systematic Theology, Vol. I: _Theology_.” But theology is not simply “the science of God,” nor even “the science of God and man.” It also gives account of the relations between God and the universe. If the universe were God, theology would be the only science. Since the universe is but a manifestation of God and is distinct from God, there are sciences of nature and of mind. Theology is “the science of the sciences,” not in the sense of including all these sciences, but in the sense of using their results and of showing their underlying ground; (see Wardlaw, Theology, 1:1, 2). Physical science is not a part of theology. As a mere physicist, Humboldt did not need to mention the name of God in his “Cosmos” (but see Cosmos, 2:418, where Humboldt says: “Psalm 104 presents an image of the whole Cosmos”). Bishop of Carlisle: “Science is atheous, and therefore cannot be atheistic.” Only when we consider the relations of finite things to God, does the study of them furnish material for theology. Anthropology is a part of theology, because man’s nature is the work of God and because God’s dealings with man throw light upon the character of God. God is known through his works and his activities. Theology therefore gives account of these works and activities so far as they come within our knowledge. All other sciences require theology for their complete explanation. Proudhon: “If you go very deeply into politics, you are sure to get into theology.” On the definition of theology, see Luthardt, Compendium der Dogmatik, 1:2; Blunt, Dict. Doct. and Hist. Theol., art.: Theology; H. B. Smith, Introd. to Christ. Theol., 44; cf. Aristotle, Metaph., 10, 7, 4; 11, 6, 4; and Lactantius, De Ira Dei, 11. II. Aim of Theology. The aim of theology is the ascertainment of the facts respecting God and the relations between God and the universe, and the exhibition of these facts in their rational unity, as connected parts of a formulated and organic system of truth.