Ectypal theology is God's accommodated self-revelation in the Word of God written. Because of the ontological distinction between the Creator and the creature God's self-revelation in the Bible is necessarily accommodated to human finitude. Scripture's anthropomorphic language about God must be understood to be analogical. Scripture, because it is the product of the Holy Spirit, is the infallible, inerrant, word of God written. Natural revelation is true but not saving.
Scripture is the primary and unique source of theology.
Study of general revelation must inform but not control our interpretation of Scripture. Theology must always account for the one and the many. The Christian faith is the most rational thing to believe but Christians do not believe it primarily because it is so. The Christian must not integrate faith and life as much as refuse to disintegrate what God has already united. Scripture is the primary and unique authority for faith and life, i.e., sola Scriptura is still the formal principle of Protestantism.