Skinner

“The strength of a love is always misjudged if we evaluate it by its immediate cause and not the stress that went before it, the dark and hollow space full of disappointment and loneliness that precedes all the great events in the heart's history.”
― Stefan Zweig, The Burning Secret and other stories

“The tragedy of this world is that no one is happy, whether stuck in a time of pain or of joy. The tragedy of this world is that everyone is alone. For a life in the past cannot be shared with the present. Each person who gets stuck in time gets stuck alone.”
― Alan Lightman, Einstein’s Dreams

“Solitude is indeed dangerous for a working intelligence. We need to have around us people who think and speak. When we are alone for a long time we people the void with phantoms”
― Guy de Maupassant, Le Horla et autres contes fantastiques

“Lonely people tend, rather, to be lonely because they decline to bear the psychic costs of being around other humans. They are allergic to people. People affect them too strongly.”
― David Foster Wallace, A Supposedly Fun Thing I'll Never Do Again: Essays and Arguments