What is the relationship between fides et theologia, “faith and theology”? In his work In Boethium de Trinitate (q. 5, a. 4, ad 8), Thomas Aquinas has this definition: “Fides est quasi habitus theologiae—faith is as it were the disposition of theology.” This definition nicely expresses the relationship between faith and theology. Theology is not faith, but it proceeds from faith and reflects on faith.