=227.= The first argument for the defence is logical, and is pressed by Chrysippus. Good implies its opposite, evil. ‘There could be no justice, unless there were also injustice; no courage, unless there were cowardice; no truth, unless there were falsehood[48].’ Just in the same way we find coarse wit in a comedy, which is objectionable in itself, and yet somehow contributes to the charm of the poem as a whole[49]. The second argument is based upon the doctrine of ‘necessary consequence’ (παρακολούθησις). The general design of the human head required that it should be compacted of small and delicate bones, accompanying which is the inevitable disadvantage that the head may easily be injured by blows[50]. War is an evil, but it turns to good by ridding the world of superfluous population[51]. In many other cases there may be explanations that are beyond our present knowledge, just as there are many kinds of animals of which we do not yet know the use[52]. [Sidenote: Moral solutions.] =228.= More important are those arguments which introduce moral considerations. In the first place the generous intentions of providence are often thwarted by the perverseness of wicked men[53], just as many a son uses his inheritance ill, and yet his father in bequeathing it to him did him a service[54]. The Deity treats good men as a Roman father his children, giving them a stern training, that they may grow in virtue[55]; those that he loves, he hardens[56]. Earthquakes and conflagrations may occur on earth, and perhaps similar catastrophes in the sky, because the world needs to be purified from the wickedness that abounds[57]. The punishment of the wicked, for instance by pestilence and famine, stands for an example to other men, that they may learn to avoid a like disaster[58]. Often, if the wicked have gone unpunished, the penalty descends on their children, their grandchildren, and their descendants[59]. [Sidenote: Divine power limited.]