"For God so loved the world that he gave his only son, so that everyone who believes in him may not perish but may have eternal life...those who do what is true come to the light, so that it may be clearly seen that their deeds have been done in God." John 3:16, 21

"In his commentary on Genesis, 'De Genesi ad Litteram,' Augustine reflected on the meaning of the words 'Fiat lux" ("And light was made") and brought into the theological tradition a perennial interest in the theology of light and of vision. Augustine notes that light was the first creature made out of 'nothing.' As the 'first incarnation' of God's Word, light is the supreme example of God's beauty or form. Moreover, since light is incorporeal, it is the most spiritual of all 'creatures.' And since light is not only incorporeal but also visible, it is the ultimate mediator between the visible and the invisible, the material and the immaterial."

Note: This image and many others with iconographic content have been generously donated to the Flickr Creative Commons by Brother Lawrence, OP.