[T]he intellect can be said truly to comprehend the meaning of propositions when it knows with certainty that they are true; and to know in this way is really to know, for it cannot be deceived in such comprehension. Since it knows that this truth cannot be otherwise, it knows also that this truth is changeless. But since our mind itself is changeable, it could not see this truth shining in so changeless a manner were it not for some other light absolutely and unchangeably resplendent; nor can this light possibly be a created light subject to change. The intellect, therefore, knows in the light that enlightens every man who comes into the world, which is the true light, and the Word in the beginning with God.
[ Bonaventure, Itinerarium Mentis in Deum 3.3, Franciscan Institute (Saint Bonaventure, NY: 1956) p. 67.]
