Evil Habits in Reaching Conclusions.—The most usual erroneous conclusions of men are these: a thing¹⁷ exists, therefore it is right: Here from capacity to live is deduced fitness, from fitness, is deduced justification. So also: an opinion gives happiness, therefore it is the true one, its effect is good, therefore it is itself good and true. Here is predicated of the effect that it gives happiness, that it is good in the sense of utility, and there is likewise predicated of the cause that it is good, but good in the sense of logical validity. Conversely, the proposition would run: a thing¹⁷ cannot attain success, cannot maintain itself, therefore it is evil: a belief troubles [the believer], occasions pain, therefore it is false. The free spirit, who is sensible of the defect in this method of reaching conclusions and has had to suffer its consequences, often succumbs to the temptation to come to the very opposite conclusions (which, in general, are, of course, equally erroneous): a thing cannot maintain itself: therefore it is good; a belief is troublesome, therefore it is true.