 These principles are known by themselves (sunt per se nota) (DOS 331; 503; QLIII2S 1, 7); our certitude of them, Kilwardby says, comes from the ‘light of truth’ (QLIS 12, 31). It is by the same light of truth that one assents to the principles/premises from the knowledge (notitia) of the terms that constitute them as well as to the conclusion from the premises (NLP I.11, 54). This act of assent is the result of some kind of illumination from the soul’s cognitive powers (QLIII2S 1, 7). The conclusion, he asserts, is the terminus of the act of intellectual cognition, but the middle term is what makes it possible, just as light makes bodily seeing possible (QLIII2S 5, 18–20). One assents to the conclusion because one comes to see how the middle term leads to the conclusion and makes the conclusion worthy of assent (QLIS 13, 33.2–3; see also DOS 472).