“At the beginning God said: “Let there be light,” and light was, and light is, and light shall be. So Christianity is rolling on, and it is going to warm all nations, and all nations are to bask in its light. Men may shut the window-blinds so they cannot see it, or they may smoke the pipe of speculation until they are shadowed under their own vaporing; but the Lord God is a sun!”

At Sunrise, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Source: The Garden of Cyrus (1658), Ch. 4

Source: The Last Song

XI, 9
The City of God (early 400s)
Context: For when God said, “Let there be light, and there was light,” if we are justified in understanding in this light the creation of the angels, then certainly they were created partakers of the eternal light which is the unchangeable Wisdom of God, by which all things were made, and whom we call the only-begotten Son of God; so that they, being illumined by the Light that created them, might themselves become light and be called “Day,” in participation of that unchangeable Light and Day which is the Word of God, by whom both themselves and all else were made. “The true Light, which lighteth every man that cometh into the world,” — this Light lighteth also every pure angel, that he may be light not in himself, but in God; from whom if an angel turn away, he becomes impure, as are all those who are called unclean spirits, and are no longer light in the Lord, but darkness in themselves, being deprived of the participation of Light eternal. For evil has no positive nature; but the loss of good has received the name “evil.”

1950s, Second Inaugural Address (1957)

Telecosm : How Infinite Bandwidth Will Revolutionize Our World (2000), p. 31
Context: Let there be light, says the Bible. All the firmaments of technology, all our computers and networks, are built with light, and of light, and for light, to hasten its spread around the world. Light glows on the telescom's periphery; it shines as its core; it illuminates its webs and its links. From Newton, Maxwell, and Einstein to Richard Feynman and Charles Townes, the more men have gazed at light, the more it turns out to be a phenomenon utterly different from anything else. And yet everything else — every atom and every molecula — is fraught with its oscillating intensity.

Source: Shadowfever

in John 1:1-5 as quoted in www.ewtn.com http://www.ewtn.com/ewtn/bible/search_bible.asp#ixzz2yvG7XIED
Gospel of John