The man who comes into the world with the notion that he is really going to instruct in matters of the highest importance, may thank his stars if he escapes with a whole skin. SECTION 39. If you want your judgment to be accepted, express it coolly and without passion. All violence has its seat in the _will_; and so, if your judgment is expressed with vehemence, people will consider it an effort of will, and not the outcome of knowledge, which is in its nature cold and unimpassioned. Since the will is the primary and radical element in human nature, and _intellect_ merely supervenes as something secondary, people are more likely to believe that the opinion you express with so much vehemence is due to the excited state of your will, rather than that the excitement of the will comes only from the ardent nature of your opinion. SECTION 40. Even when you are fully justified in praising yourself, you should never be seduced into doing so. For vanity is so very common, and merit so very uncommon, that even if a man appears to be praising himself, though very indirectly, people will be ready to lay a hundred to one that he is talking out of pure vanity, and that he has not sense enough to see what a fool he is making of himself. Still, for all that, there may be some truth in Bacon's remark that, as in the case of calumny, if you throw enough dirt, some of it will stick, so it it also in regard to self-praise; with the conclusion that self-praise, in small doses, is to be recommended.[1] [Footnote 1: _Translator's Note_.--Schopenhauer alludes to the following passage in Bacon's _De Augmentis Scientiarum_, Bk. viii., ch. 2: _Sicut enim dici solet de calumnia_, audacter calumniare, semper aliquid haeret; _sic dici potest de jactantia, (nisi plane deformis fuerit et ridicula_), audacter te vendita, semper aliquid haeret. _Haerebit certe apud populum, licet prudentiores subrideant. Itaque existimatio parta apud plurimos paucorum fastidium abunde compensabit._] SECTION 41. If you have reason to suspect that a person is telling you a lie, look as though you believed every word he said. This will give him courage to go on; he will become more vehement in his assertions, and in the end betray himself. Again, if you perceive that a person is trying to conceal something from you, but with only partial success, look as though you did not believe him, This opposition on your part will provoke him into leading out his reserve of truth and bringing the whole force of it to bear upon your incredulity. SECTION 42. You should regard all your private affairs as secrets, and, in respect of them, treat your acquaintances, even though you are on good terms with them, as perfect strangers, letting them know nothing more than they can see for themselves. For in course of time, and under altered circumstances, you may find it a disadvantage that they know even the most harmless things about you.