Quotes about darkness
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“Like most hearts, it was complicated, shaded with dark and dappled with light.”
“There is nothing in the dark that isn't there when the lights are on.”

“Now it's the dark's turn to be afraid.”
Source: Curse of the Bane

“The guilty one is not he who commits the sin, but he who causes the darkness.”
Source: Les Misérables

“I am the son of Hades. I go where I wish. The darkness is my birthright.”
Source: The Blood of Olympus

“A million faces at my feet but all I see are dark eyes.”
Song lyrics, Empire Burlesque (1985), Dark Eyes
Variant: All I see are dark eyes.
“The light had simply and utterly destroyed the darkness.”
Source: Renegade

The first published appearance of this "ad" is on the first page of a 1949 book by Julian Lewis Watkins, The 100 Greatest Advertisements: Who Wrote Them and What They Did. (Moore Publishing Company), except with the Americanized word "honor", rather than "honour".
“Am I a vampire?" Massie asked.
"Huh?" Alicia asked.
"Then why are you keeping me in the dark?”
Source: Invasion of the Boy Snatchers

“Hello darkness, my old friend
I've come to talk with you again”
The Sound of Silence Full lyrics online http://www.paul-simon.info/HTML/U-SOS.html
Song lyrics, Wednesday Morning, 3 A.M. (1964)
Context: Hello darkness, my old friend
I've come to talk with you again
Because a vision softly creeping
Left its seeds while I was sleeping
And the vision that was planted in my brain
Still remains
Within the sound of silence.
Source: Forever and a Day

Source: The Gifts of Imperfection: Let Go of Who You Think You're Supposed to Be and Embrace Who You Are

“Sometimes it is easier to see the light when you stand partly in the darkness.”
Source: Mister Monday

“Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.”
This may be original with Groucho, but the Quote Investigator http://quoteinvestigator.com/category/jim-brewer/ mentions the earliest report found in a 1958 issue of Boy's Life magazine where it is attributed to Jim Brewer.
Misattributed
Variant: Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.
Source: The Essential Groucho: Writings For By And About Groucho Marx

“When it came to the dark fuckery of the human heart, there seemed to be no limit.”
Source: Full Dark, No Stars

“The leaves of memory seemed to make
A mournful rustling in the dark.”
The Fire of Drift-wood, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“In the dark times
Will there also be singing?
Yes, there will also be singing
About the dark times.”
In den finsteren Zeiten
Wird da auch gesungen werden?
Da wird auch gesungen werden.
Von den finsteren Zeiten.
"Motto to the 'Svendborg Poems' " [Motto der 'Svendborger Gedichte] (1939), trans. John Willett in Poems, 1913-1956, p. 320
Poems, 1913-1956 (1976)

Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead
Source: Secrets of a Summer Night

“Childhood is measured out by sounds and smells and sights, before the dark hour of reason grows.”
Part 2, Chapter 9.2; Nora to an ill and unresponsive Einstein at the veterinary clinic
Watchers (1987)
Context: I thought of you as my guardian, Einstein… you taught me that I'm your guardian, too, that I'm Travis's guardian, and he is my guardian and yours. We have a responsibility to stand watch over one another, we are watchers, all of us, watchers, guarding against the darkness. You've taught me that we're all needed, even those who sometimes think we're worthless, plain, and dull.
“It was a dark and stormy night.”
Source: A Wrinkle in Time

“Carry a candle in the dark, be a candle in the dark, know that you're a flame in the dark.”
Source: How to Take the Ex Out of Ex-Boyfriend

Usher II (1950)
The Martian Chronicles (1950)
Source: Fahrenheit 451
Context: They began by controlling books of cartoons and then detective books and, of course, films, one way or another, one group or another, political bias, religious prejudice, union pressures; there was always a minority afraid of something, and a great majority afraid of the dark, afraid of the future, afraid of the past, afraid of the present, afraid of themselves and shadows of themselves.
“Never doubt God in the darkness what he has given us in the light.”
Source: A Voice in the Wind

On the Alex Jones Radio show, as quoted in "David Lynch Questions 9/11 On National U.S. Radio" in Prison Planet (25 January 2007)
Source: Catching the Big Fish: Meditation, Consciousness, and Creativity
Context: There's so many problems in our world, so much negativity. Don't worry about the darkness — turn on the light and the darkness automatically goes. Ramp up the light of unity within — help do that for yourself, help do that for the world and then we're really doing something, we're doing something that brings that light of unity.
Source: Magic Slays

“A man must dream a long time in order to act with grandeur, and dreaming is nursed in darkness.”
“Calvin: I think nighttime is dark so you can imagine your fears with less distraction.
p77”
Source: The Indispensable Calvin and Hobbes

Source: Lord of the Flies (1954), Ch. 12: The Cry of the Hunters
Context: His voice rose under the black smoke before the burning wreckage of the island; and infected by that emotion, the other little boys began to shake and sob too. And in the middle of them, with filthy body, matted hair, and unwiped nose, Ralph wept for the end of innocence, the darkness of man's heart, and the fall through the air of the true, wise friend called Piggy.

Opening lines, Ch. 1, "The River Bank"
Source: The Wind in the Willows (1908)
Context: The Mole had been working very hard all the morning, spring-cleaning his little home. First with brooms, then with dusters; then on ladders and steps and chairs, with a brush and a pail of whitewash; till he had dust in his throat and eyes, and splashes of whitewash all over his black fur, and an aching back and weary arms. Spring was moving in the air above and in the earth below and around him, penetrating even his dark and lowly little house with its spirit of divine discontent and longing.
Source: The Nightingale
Source: A Wrinkle in Time

“Humility like darkness reveals the heavenly lights.”
Source: Away

“The exceeding brightness of this early sun
Makes me conceive how dark I have become.”
Source: The Palm at the End of the Mind: Selected Poems and a Play
“A friend is someone whose face you can see in the dark.”
Source: The Secret Language of Girls
“It was a sign of growing up, when the dark made no more difference to you than the day.”
Source: Paddy Clarke Ha Ha Ha
“Maybe you have to know darkness before you can appreciate the light.”
Source: A Ring of Endless Light (1980)

“I wonder if, in the dark night of the sea, the octopus dreams of me.”

“In order for the light to shine so brightly, the darkness must be present.”
Source: Dark of Night

“There is beauty in everything, even in silence and darkness.”
Source: Silver Brumby's Daughter
Source: In the Woods

“When Jack Burns needed to hold his mother's hand, his fingers could see in the dark.”
Source: Until I Find You
“I live in the light,
But carry my dark with me.”
Source: The Dead of Night