13. But if an act necessarily includes intention, what is the nature of the restriction implied in calling it external? An external action is a determination of will as exhibited in certain motions of the bodily members which produce certain effects in the material world; not a determination of the will as arising from certain motives and a certain disposition. All that the law can do is to enjoin or forbid determinations of will as exhibited in such motions, &c. It does indeed present a motive, for it enforces its injunctions and prohibitions primarily by fear, by its threat of certain consequences if its commands are disobeyed. This enforcement is not an exercise of physical force in the strict sense, for in this sense no force can produce an action, since it cannot produce a determination of will; and the only way in which the law or its administrators employ such force is not in the production but in the prevention of action (as when a criminal is locked up or the police prevent mischievous persons from assaulting us or breaking into our houses). But though, in enforcing its commands by threats, the law is presenting a motive, and thus, according to our distinction, affecting action on its inner side, it does this solely for the sake of the external act. It does not regard the relation of the act to the motive fear as of any intrinsic importance. If the action is performed without this motive ever coming into play under the influence of what the moralist counts higher motives, the purpose of the law is equally satisfied. Indeed, it is always understood that its purpose is most thoroughly served when the threat of pains and penalties has ceased to be necessary, and the obligations correlative to the relations of individuals and of societies are fulfilled from other motives. Its business is to maintain certain conditions of life--to see that certain actions are done which are necessary to the maintenance of those conditions, others omitted which would interfere with them. It has nothing to do with the motive of the actions or omissions, on which, however, the moral value of them depends.