“Not every light is a true light;
To the wise the light of truth is light itself.”

The Manual of the Warrior of Light (1997)
Context: Every Warrior of the Light has suffered for the most trivial of reasons. Every Warrior of the Light has, at least once, believed he was not a Warrior of the Light.
Every Warrior of the Light has failed in his spiritual duties.
Every Warrior of the Light has said "yes" when he wanted to say "no."
Every Warrior of the Light has hurt someone he loved.
That is why he is a Warrior of the Light, because he has been through all this and yet has never lost hope of being better than he is.
Each stone, each bend cries welcome to him. He identifies with the mountains and the streams, he sees something of his own soul in the plants and the animals and the birds of the field.
Then, accepting the help of God and of God's signs, he allows his personal legend to guide him toward the tasks that life has reserved for him.
On some nights, he has nowhere to sleep, on others he suffers from insomnia. "That's just how it is," thinks the warrior. "I was the one who chose to walk this path."
In these words lies all his power: He chose the path along which he is walking and so has no complaints.

The Golden Legend, Pt. V, A Covered Bridge at Lucerne.

"Seek the Light" (co-written with May East and Craig Gibsone)
Universal Hall (2003)

A Dynamical Theory of the Electromagnetic Field (1864), §20.
Context: The general equations are next applied to the case of a magnetic disturbance propagated through a non-conductive field, and it is shown that the only disturbances which can be so propagated are those which are transverse to the direction of propagation, and that the velocity of propagation is the velocity v, found from experiments such as those of Weber, which expresses the number of electrostatic units of electricity which are contained in one electromagnetic unit. This velocity is so nearly that of light, that it seems we have strong reason to conclude that light itself (including radiant heat, and other radiations if any) is an electromagnetic disturbance in the form of waves propagated through the electromagnetic field according to electromagnetic laws.

As quoted in Readings in American art, 1900 -1975 (1975) by Barbara Rose, p. 117
1970s and later
Variant: In nature, light creates the color. In the picture, color creates the light.

Source: Dracula

also translated as "A body actually enlightened may become obscure by adding new light to that which it has already received." in The Penny cyclopaedia (1845), http://books.google.com/books?id=O4uLUvHTKGsC&pg=PA668 p. 668.
First account of an interference effect in Physico-mathesis de lumine, coloribus, et iride, aliisque adnexis libri duo: opus posthumum, published in Bologna (1665), http://books.google.com/books?id=FzYVAAAAQAAJ&printsec=frontcover&source=gbs_summary_r&cad=0#PPP28,M1 Proposition XXII.

Choruses from The Rock (1934)