De Sacramentis 1.3.3

1.3.3. God has made himself known by two ways: (a) human reason and (b) divine revelation. What human reason knows of God is further subdivided into (i) what reason knows of God in itself (see 1.3.6ff) and (ii) what reason knows of God through those things outside it. Divine revelation is similarly subdivided into (i) the illumination by aspiration and (ii) the instruction by teaching and miracles.