Sagan

“But the Hebrew word, the word timshel—‘Thou mayest’— that gives a choice. It might be the most important word in the world. That says the way is open. That throws it right back on a man. For if ‘Thou mayest’—it is also true that ‘Thou mayest not.”
― John Steinbeck, East of Eden

“There is neither happiness nor misery in the world; there is only the comparison of one state with another, nothing more. He who has felt the deepest grief is best able to experience supreme happiness. We must have felt what it is to die, Morrel, that we may appreciate the enjoyments of life.
" Live, then, and be happy, beloved children of my heart, and never forget, that until the day God will deign to reveal the future to man, all human wisdom is contained in these two words, 'Wait and Hope.”
― Alexandre Dumas

“Were knowledge all, what were our need
To thrill and faint and sweetly bleed?”
― Christopher Brennan

“I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth.”
― Umberto Eco, Foucault’s Pendulum