MIGUEL DE UNAMUNO: " There is something which, for lack of a better name, we will call the tragic sense of life, which carries with it a whole conception of life itself and of the universe, a whole philosophy more or less formulated, more or less conscious. And this sense may be possessed, and is possessed, not only by individual men but by whole peoples. And this sense does not so much flow from ideas as determine them, even though afterwards, as is manifest, these ideas react upon it and confirm it. Sometimes it may originate in a chance illness--dyspepsia, for example; but at other times it is constitutional. And it is useless to speak...of men who are healthy and men who are not healthy. Apart from the fact that there is no normal standard of health, nobody has proved that man is necessarily cheerful by nature. And further, man, by the very fact of being man, of possessing consciousness, is, in comparison with the ass or the crab, a diseased animal. Consciousness is a disease. "
pp. 17-18