But how will this end be achieved? That Man cannot discover the path of salvation for himself will, of course, be taken for granted. The catastrophe of the Fall has corrupted his whole nature, and has therefore blinded him to the light of truth. "The way of man is not in himself: it is not in man that walketh to direct his steps." The promptings of his own nature, which he would follow if left to himself, can do nothing but lead him astray. It will also be taken for granted that the path of salvation is a path of action. When the whole inward disposition is hopelessly corrupt, the idea of achieving salvation by growing, by bringing one's hidden life to the perfection of maturity, must perforce be abandoned. It is only by _doing_ God's will that Man can hope to regain his favour. One thing, then, is clear. Man must be told in exact detail what he is to do and also (should this be necessary) how he is to do it. In other words, an elaborate Code of Law, covering the whole range of human life and regulating all the details of conduct, must be delivered by God to Man. If Man will obey this Law he will be saved. If he will not obey it, he will be lost. There is another aspect of the idea of a supernatural revelation on which it is necessary to touch. As intercourse between Nature and the Supernatural world takes place, not in the natural order of things but at the good pleasure of the Supernatural God, revelation must needs be conceived of as a highly-specialised process. A revelation which was addressed to the whole human race, and to which the whole human race was able to respond, could scarcely be regarded as of supernatural origin. The distinction between the supernaturalness of the appeal and the naturalness of the response would gradually tend to efface itself: for "what is universal is natural," and the voice which every man was able to recognise would come at last to be regarded as a voice from within oneself. If the supernatural character of an alleged revelation is to be established, its uniqueness must be duly emphasised. A particular people must be chosen for the purpose of the divine experiment. A particular law-giver must be commissioned to declare to the chosen people the will of the Supernatural God. And from time to time a particular prophet must be sent to rebuke the chosen people for its backslidings, to show it where it has gone astray, and to exhort it to turn again to its God.