Just as it is impossible without oil and flame for a lamp to bum and thus to give light to those in the house, so it is impossible without the divine fire and Spirit for a soul to speak clearly about divine matters and to illumine others. For every perfect gift bestowed on the devout soul 'is from above . . . from the Father of lights, in whom there is no variableness or shadow due to change' (Jas. 1:17).
On the Practice of the Virtues: One Hundred Texts