In this chapter St Thomas labours to dispel the difficulties of ittisâl, that conjunction of the human mind with a superior intelligence, which Averroes and the Arabian school dreamt of; and thought to see fulfilled in this life (B. II, Chapp. LIX sq.) which is fulfilled, although in a different manner, by Christian faith and charity, sanctifying grace and sacraments; which has its perfect fulfilment in the beatific vision. It is a white counter, inscribed with a new name, which none knoweth but him who receiveth (Apoc. ii, 17). I mean, there are difficulties in the explanation of it, beyond the power of mortal faculties to solve.
Of God and His Creatures: 3.54