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" Just as a physician might say that there very likely is not one single living human being who is completely healthy, so anyone who really knows mankind might say that there is not one single living human being who does not despair a little, who does not secretly harbor an unrest, an inner strife, a disharmony, an anxiety about an unknown something or a something he does not even dare try to know, an anxiety about some possibility in existence or an anxiety about himself, so that, just as the physician speaks of going around with an illness in the body, he walks around with a sickness, carries around a sickness of the spirit that signals its presence at rare intervals in and through an anxiety he cannot explain. "
― Søren Kierkegaard , Fear and Trembling and The Sickness Unto Death
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" In any case one can never forbear to smile at such a despairer, who, humanly speaking, although he is in despair, is so very innocent. Commonly such a despairer is infinitely comic. Think of a self (and next to God there is nothing so eternal as a self), and then that this self gets the notion of asking whether it might not let itself become or be made into another…than itself. And yet such a despairer, whose only wish is this most crazy of all transformations, loves to think that this change might be accomplished as easily as changing a coat. For the immediate man does not recognize his self, he recognizes himself only by his dress, he recognizes (and here again appears the infinitely comic trait) he recognizes that he has a self only by externals. "
― Søren Kierkegaard , Fear and Trembling and The Sickness Unto Death