"The greatest weight. — What, if some day or night a demon were to steal after you into your loneliest loneliness and say to you: ‘This life as you now live it and have lived it, you will have to live once more and innumerable times more; and there will be nothing new in it, but every pain and every joy and every thought and sigh and everything unutterably small or great in your life will have to return to you, all in the same succession and sequence even this spider and this moonlight between the trees, and even this moment and I myself. The eternal hourglass of existence is turned upside down again and again, and you with it, speck of dust!’

Would you not throw yourself down and gnash your teeth and curse the demon who spoke thus? Or have you once experienced a tremendous moment when you would have answered him: ‘You are a god and never have I heard anything more divine.’ If this thought gained possession of you, it would change you as you are or perhaps crush you. The question in each and every thing, ‘Do you desire this once more and innumerable times more?’ would lie upon your actions as the greatest weight. Or how well disposed would you have to become to yourself and to life to crave nothing more fervently than this ultimate eternal confirmation and seal?” - The Gay Science by Friedrich Nietzsche

“If a man's imagination were not so weak, so easily tired, if his capacity for wonder not so limited, he would abandon forever such fantasies of the supernal. He would learn to perceive in water, leaves and silence more than sufficient of the absolute and marvelous, more than enough to console him for the loss of the ancient dreams.” - Desert Solitaire by Edward Abbey

”Original sin, the true original sin, is the blind destruction for the sake of greed of this natural paradise which lies all around us — if only we were worthy of it. Now when I write of paradise I mean Paradise, not the banal Heaven of the saints. When I write ‘paradise’ I mean not only apple trees and golden women but also scorpions and tarantulas and flies, rattlesnakes and Gila monsters, sandstorms, volcanos and earthquakes, bacteria and bear, cactus, yucca, bladderweed, ocotillo and mesquite, flash floods and quicksand, and yes — disease and death and the rotting of the flesh.” - Desert Solitaire by Edward Abbey

“So I withdrew and thought to myself: 'I am wiser than this man; it is likely that neither of us knows anything worthwhile, but he thinks he knows something when he does not, whereas when I do not know, neither do I think I know; so l am likely to be wiser than he to this small extent, that I do not think I know what I do not know.'“ - Apology of Socrates by Plato