Causa prima est actus purus, nihil habens potentialitatis adiunctum; et ideo ipsa est lumen purum a quo omnia alia illuminantur et cognoscibilia redduntur.
"The first cause is pure act, having no adjoined potentiality; and thus is itself pure light by which all other things are illuminated and rendered knowable."
Super De causis, lect. 6
