Thesis advisor: Frederick G. LawrenceThis dissertation seeks to answer the question, arising from Bernard Lonergan's 1972 lectures on philosophy of God and systematic theology, of why he thinks philosophy of God, or natural theology, should be included within the functional specialty Systematics. The author argues that a key to the answer is an analysis of the concrete operations performed by philosophers as they pursue the question of God. Relevant to the distinction between and unity of philosophy of God and Systematics are both natural knowledge of God, which consists of affirmations and negations that can be immanently generated, and supernatural knowledge, which consists of affirmations and negations that cannot be immanently generat...