For the light which is the object of our senses does not shine in darkness, but apart from it; but the preaching of Christ has shone forth in the midst of prevailing error, and made it to disappear.
-St. John Chrysostom, Homily 5 on John 1, 4th Century


But this light comes by faith, and when it is come, it lights abundantly him that has received it; and if you display a pure life for it, remains indwelling within continually.
-St. John Chrysostom, Homily 5 on John 1, 4th Century


As then one cannot rightly enjoy the sunlight,unless he opens his eyes; so neither can one largely share this splendor, unless he have expanded the eye of the soul, and rendered it in every way keen of sight.
-St. John Chrysostom, Homily 5 on John 1, 4th Century


But how is this effected? Then when we have cleansed the soul from all the passions. For sin is darkness, and a deep darkness; as is clear, because men do it unconsciously and secretly.
-St. John Chrysostom, Homily 5 on John 1, 4th Century