“Moons and years pass by and are gone forever, but a beautiful moment shimmers through life a ray of light.”

Guesses at Truth (1827)

Source: Divine Secrets of the Ya-Ya Sisterhood

Source: The Discovery of the Child (1948), Ch. 8 : The Exercises, p. 141
Variant translation:
This then is the first duty of an educator: to stir up life but leave it free to develop.
Context: This is our mission: to cast a ray of light and pass on. I compare the effects of these first lessons the impressions of a solitary wanderer who is walking serene and happy in a shady grove, meditating; that is leaving his inner thought free to wander. Suddenly a church bell pealing out nearby recalls to himself; then he feels more keenly that peaceful bliss which had already been born, though dormant, within him.
To stimulate life, leaving it free, however, to unfold itself, that is the first duty of the educator.
For such a delicate mission great art is required to suggest the right moment and to limit intervention, last one should disturb or lead astray rather than help the soul which is coming to life and which will live by virtue of it's own efforts.
This art must accompany the scientific method, because the simplicity of our lessons bears a great resemblance to experiments in experimental psychology.

Source: The Vampire Lestat

Light (1919), Ch. XVI - De Profundis Clamavi
Context: Men have gone towards each other because of that ray of light which each of them contains; and light resembles light. It reveals that the isolated man, too free in the open expanses, is doomed to adversity as if he were a captive, in spite of appearances; and that men must come together that they may be stronger, that they may be more peaceful, and even that they may be able to live.
For men are made to live their life in its depth, and also in all its length. Stronger than the elements and keener than all terrors are the hunger to last long, the passion to possess one's days to the very end and to make the best of them. It is not only a right; it is a virtue.

Lurker's Guide to Babylon 5 : "Passing Through Gethsemane : jms speaks" (13 July (2004) http://www.midwinter.com/lurk/countries/us/guide/048.html.
Context: As an atheist, I believe that all life is unspeakably precious, because it’s only here for a brief moment, a flare against the dark, and then it’s gone forever. No afterlives, no second chances, no backsies. So there can be nothing crueler than the abuse, destruction or wanton taking of a life. It is a crime no less than burning the Mona Lisa, for there is always just one of each. So I cannot forgive.

Query 3
Opticks (1704)
Context: Are not the Rays of Light in passing by the edges and sides of Bodies, bent several times backwards and forwards, with a motion like that of an Eel? And do not the three Fringes of colour'd Light... arise from three such bendings?

On the loss of site-specific artwork in “Gronk by Marisela Norte” https://bombmagazine.org/articles/gronk/ in BOMB Magazine (2007 Jan 1)