God is the chief efficient cause of Theology . . .

The instrumental cause of Theology is the Word of God, spoken through the mouth of men divinely inspired and called directly by God, and recorded in the holy books (1 Pet 1:12, 2 Pet 1:21, Acts 20:27, 1 Thess 2:13 and 4:8).

Synopsis of a Purer Theology, Vol. 1, 4-5.