“Shanne said, “You are quiet; are you sad?”
“In a way. Do you know why?”
She put her hand across his mouth. “Never speak of it. What must be, will be. What can never be—can never be.”
Ghyl turned to look at her, trying to divine every last scintilla of her meaning.
“But,” she added in a soft voice, “what can be—can be.””

Variant: You may not be her first, her last, or her only. She loved before she may love again. But if she loves you now, what else matters? She's not perfect — you aren't either, and the two of you may never be perfect together but if she can make you laugh, cause you to think twice, and admit to being human and making mistakes, hold onto her and give her the most you can. She may not be thinking about you every second of the day, but she will give you a part of her that she knows you can break — her heart. So don't hurt her, don't change her, don't analyze and don't expect more than she can give. Smile when she makes you happy, let her know when she makes you mad, and miss her when she's not there.

Source: A Gift From Earth (1968), Ch. 2 : The Sons Of Earth

Nobel Prize Lecture (1993)
Context: "Once upon a time there was an old woman. Blind but wise." Or was it an old man? A guru, perhaps. Or a griot soothing restless children. I have heard this story, or one exactly like it, in the lore of several cultures.
"Once upon a time there was an old woman. Blind. Wise."
In the version I know the woman is the daughter of slaves, black, American, and lives alone in a small house outside of town. Her reputation for wisdom is without peer and without question. Among her people she is both the law and its transgression. The honor she is paid and the awe in which she is held reach beyond her neighborhood to places far away; to the city where the intelligence of rural prophets is the source of much amusement.
One day the woman is visited by some young people who seem to be bent on disproving her clairvoyance and showing her up for the fraud they believe she is. Their plan is simple: they enter her house and ask the one question the answer to which rides solely on her difference from them, a difference they regard as a profound disability: her blindness. They stand before her, and one of them says, "Old woman, I hold in my hand a bird. Tell me whether it is living or dead."
She does not answer, and the question is repeated. "Is the bird I am holding living or dead?"
Still she doesn't answer. She is blind and cannot see her visitors, let alone what is in their hands. She does not know their color, gender or homeland. She only knows their motive.
The old woman's silence is so long, the young people have trouble holding their laughter.
Finally she speaks and her voice is soft but stern. "I don't know", she says. "I don't know whether the bird you are holding is dead or alive, but what I do know is that it is in your hands. It is in your hands."

Uptown Girl.
Song lyrics, An Innocent Man (1983)

Source: Emphyrio (1969), Chapter 12

Source: Revenge of the Witch

Murder on the Orient Express (1934)

Source: Extremely Loud and Incredibly Close