Nas

“People are not disturbed by things, but by the views they take of them.”
― Epictetus, Enchiridion

“But man is not made for defeat," he said. "A man can be destroyed but not defeated.”
― Ernest Hemingway, The Old Man and the Sea

“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

“The important thing is moral choice. Evil has to exist along with good, in order that moral choice may operate. Life is sustained by the grinding opposition of moral entities.”
― Anthony Burgess, A Clockwork Orange