RealityCheck

“There are four simple ways for the observant to tell Mr. Croup and Mr. Vandemar apart: first, Mr. Vandemar is two and a half heads taller than Mr. Croup; second, Mr. Croup has eyes of a faded china blue, while Mr. Vandemar's eyes are brown; third, while Mr. Vandemar fashioned the rings he wears on his right hand out of the skulls of four ravens, Mr. Croup has no obvious jewelery; fourth, Mr. Croup likes words, while Mr. Vandemar is always hungry. Also, they look nothing at all alike.”
― Neil Gaiman, Neverwhere

“It is our suffering that brings us together. It is not love. Love does not obey the mind, and turns to hate when forced. The bond that binds us is beyond choice. We are brothers. We are brothers in what we share. In pain, which each of us must suffer alone, in hunger, in poverty, in hope, we know our brotherhood. We know it, because we have had to learn it. We know that there is no help for us but from one another, that no hand will save us if we do not reach out our hand. And the hand that you reach out is empty, as mine is. You have nothing. You possess nothing. You own nothing. You are free. All you have is what you are, and what you give.”
― Ursula K. Le Guin, The Dispossessed: An Ambiguous Utopia

“I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.”
― Frank Herbert, Dune

“The unknown," said Faxe's soft voice in the forest, "the unforetold, the unproven, that is what life is based on. Ignorance is the ground of thought. Unproof is the ground of action. If it were proven that there is no God there would be no religion. No Handdara, no Yomesh, no hearthgods, nothing. But also if it were proven that there is a God, there would be no religion. ... Tell me, Genry, what is known? What is sure, unpredictable, inevitable -- the one certain thing you know concerning your future, and mine?"

That we shall die."

Yes, There's really only one question that can be answered, Genry, and we already know the answer. ... The only thing that makes life possible is permanent, intolerable uncertainty: not knowing what comes next.”
― Ursula K. Le Guin, The Left Hand of Darkness