God the Father, in the Son and through the Holy Spirit, is the first efficient cause of the writing of these individual books by his order and instigation (Exod 17:14; Jer 36:1[-4]; Rev 1:1, chapter 2, etc.). The ministers or instruments are holy servants of the Lord, ‘called by God and breathed upon by Him,’ and ‘driven’ by the Holy Spirit. Hence Scripture is called “God-breathed” (2 Tim 3:16; Rom 16:26; 2 Pet 1:20).

Synopsis of a Purer Theology, Vol. 1, 20.