Moreover, the methodical search for truth is itself the outcome of those ages in which convictions were at war with each other. If the individual had not cared about _his_ "truth," that is to say, about carrying his point, there would have been no method of investigation; thus, however, by the eternal struggle of the claims of different individuals to absolute truth, people went on step by step to find irrefragable principles according to which the rights of the claims could be tested and the dispute settled. At first people decided according to authorities; later on they criticised one another's ways and means of finding the presumed truth; in the interval there was a period when people deduced the consequences of the adverse theory, and perhaps found them to be productive of injury and unhappiness; from which it was then to be inferred by every one that the conviction of the adversary involved an error. The _personal struggle of the thinker_ at last so sharpened his methods that real truths could be discovered, and the mistakes of former methods exposed before the eyes of all. 635. On the whole, scientific methods are at least as important results of investigation as any other results, for the scientific spirit is based upon a knowledge of method, and if the methods were lost, all the results of science could not prevent the renewed prevalence of superstition and absurdity. Clever people may _learn_ as much as they like of the results of science, but one still notices in their conversation, and especially in the hypotheses they make, that they lack the scientific spirit; they have not the instinctive distrust of the devious courses of thinking which, in consequence of long training, has taken root in the soul of every scientific man. It is enough for them to find any kind of hypothesis on a subject, they are then all on fire for it, and imagine the matter is thereby settled. To have an opinion is with them equivalent to immediately becoming fanatical for it, and finally taking it to heart as a conviction. In the case of an unexplained matter they become heated for the first idea that comes into their head which has any resemblance to an explanation--a course from which the worst results constantly follow, especially in the field of politics. On that account everybody should nowadays have become thoroughly acquainted with at least _one_ science, for then surely he knows what is meant by method, and how necessary is the extremest carefulness. To women in particular this advice is to be given at present; as to those who are irretrievably the victims of all hypotheses, especially when these have the appearance of being witty, attractive, enlivening, and invigorating. Indeed, on close inspection one sees that by far the greater number of educated people still desire convictions from a thinker and nothing but _convictions,_ and that only a small minority want _certainty._ The former want to be forcibly