It is, then, obvious that, just as I am not wrong, that is, right in resisting violence by violence, so where violence is not feasible, or it appears more convenient, I am at liberty to resort to cunning; accordingly, whenever I am entitled to use force, I may, if I please, employ falsehood; for instance, against robbers and miscreants of every sort, whom in this way I entice into a trap. Hence a promise which is extorted by violence is not binding. But, as a matter of fact, the right to avail myself of lies extends further. It occurs whenever an unjustifiable question is asked, which has to do with my private, or business affairs, and is hence prompted by curiosity; for to answer it, or even to put it off by the suspicion-awakening words, "I can't tell you," would expose me to danger. Here an untruth is the indispensable weapon against unwarranted inquisitiveness, whose motive is hardly ever a well-meaning one. For, just as I have the right to oppose the apparent bad will of another, and to anticipate with physical resistance, to the danger of my would-be aggressor, the physical violence presumably thence resulting; so that, for instance, as a precaution, I can protect my garden wall with sharp spikes, let loose savage dogs in my court at night, and even, if circumstances require it, set man-traps and spring-guns, for the evil consequences of which the burglar has only himself to thank:--if I have the right to do this, then I am equally authorised in keeping secret, at any price, that which, if known, would lay me bare to the attack of others. And I have good reason for acting thus, because, in moral, no less than in physical, relations, I am driven to assume that the bad will of others is very possible, and must therefore take all necessary preventive measures beforehand. Whence Ariosto says:-- _Quantunque il similar sia le più volte_ _Ripreso, e dia di mala mente indict,_ _Si trova pure in molte cose e molte_ _Avere fatti evidenti benefici,_ _E danni e biasmi e morti avere tolte:_ _Che non conversiam' sempre con gli amici,_ _In questa assai più oscura che serena_ _Vita mortal, tutta d'invidia piena_[10] _--Orl. Fur._, IV., 1.