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Bad habits in making conclusions. The most common false conclusions of men are these: a thing exists, therefore it is legitimate. Here one is concluding functionality from viability, and legitimacy from functionality. Furthermore, if an opinion makes us glad, it must be true; if its effect is good, it in itself must be good and true. Here one is attributing to the effect the predicate "gladdening," "good," in the sense of the useful, and providing the cause with the same predicate "good," but now in the sense of the logically valid. The reversal of the proposition is: if a thing cannot prevail and maintain itself, it must be wrong; if an opinion tortures and agitates, it must be false. The free spirit, who comes to know all too well the error of this sort of deduction and has to suffer from its consequences, often succumbs to the temptation of making contrary deductions, which are in general naturally just as false: if a thing cannot prevail, it must be good; if an opinion troubles and disturbs, it must be true.