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" ...[A]ll the elements which belong to the notion of happiness are altogether empirical, that is, they must be borrowed from experience, and nevertheless the idea of happiness requires an absolute whole, a maximum of welfare in my present and all future circumstances. Now it is impossible that the most clear-sighted and at the same time most powerful being (supposed finite) should frame to himself a definite conception of what he really wills in this. Does he will riches, how much anxiety, envy, and snares might he not thereby draw upon his shoulders? Does he will knowledge and discernment, perhaps it might prove to be only an eye so much the sharper to show him so much the more fearfully the evils that are now concealed from him and that cannot be avoided, or to impose more wants on his desires, which already give him concern enough. Would he have long life? Who guarantees to him that it would not be a long misery? Would he at least have health? How often has uneasiness of the body restrained from excesses into which perfect health would have allowed one to fall, and so on? In short, he is unable, on any principle, to determine with certainty what would make him truly happy; because to do so he would need to be omniscient. "
― Immanuel Kant , Groundwork of the Metaphysics of Morals
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" ...nothing is more dangerous than solitude: there our imagination, always disposed to rise, taking a new flight on the wings of fancy, pictures to us a chain of beings of whom we seem the most inferior. All things appear greater than they really are, and all seem superior to us. This operation of the mind is quite natural: we so continually feel our own imperfections, and fancy we perceive in others the qualities we do not possess, attributing to them also all that we enjoy ourselves, that by this process we form the idea of a perfect, happy man,—a man, however, who only exists in our own imagination. "
― Johann Wolfgang von Goethe , The Sorrows of Young Werther