The Divine Light illumines the pure heart and the pure intellect because these are susceptible to receiving light; whereas impure hearts and intellects, not being susceptible to receiving illumination, have an aversion to the light of knowledge, the light of truth; they like darkness… God loves those who have a pure heart, listens to their prayers, grants them their requests that lead to salvation, reveals Himself to them and teaches the mysteries of the Divine nature.
St Nektarios of Aegina