There is no question that the spirit, when it begins to be frequently under the influence of the divine light becomes wholly translucent, to the point of itself seeing the fullness of its own light… But Saint Paul clearly teaches that everything which appears to it in bodily shape…comes from the malice of the enemy, when he says that the enemy disguises himself as an angel of light (2 Corinthians 11.14). The ascetic life must not therefore be undertaken with such a hope in mind… It's sole purpose is to come to love God with a sensation in the heart of total certainty, which means ‘with all your heart, and with all your soul, and with all your strength, and with all your mind’ (Luke 10.27).
DIADOCHUS OF PHOTIKE Gnostic Chapters, 40