The facts concerning the order of nature which it is claimed are placed beyond controversy may be stated in the following words: Now of all the results of science, none is more universal and more emphatic than this: that there is no arbitrariness in the series of events which constitute our experience; but that a perfect order or uniformity prevails through them all, an order which our intellect can apprehend under the form of cause and effect, or _permanent_ force and _necessary_ phenomena, or, better, a constant persistency of amount both of matter and force in the universe.[424] This statement of the scientist is accepted by many theologians (of the Calvinistic school), who say with Rev. William Knight, "The doctrine of the persistence of physical force and the invariability of natural law, is a physical truth of which the theological phase or corollary is the uniformity of Divine operation and the inviolableness of Divine love. 'The permanence of the order of nature' is the scientific equivalent of the Divine constancy--'the same yesterday, to-day, and forever.'"[425] How far and in what sense we accept this doctrine will be seen as we advance in the discussion. At the beginning of this chapter we remarked that if the Christian doctrine of the efficacy of prayer is disputed, whether on _theoretical_ or _experiential_ grounds, an adequate and complete defense can only be made by falling back upon the fundamental conception of God, and the relation of God to nature and humanity presented in the preceding chapters of this volume. Is there a God in the proper and commonly accepted sense of the term--a conscious, free, personal First Cause, the Creator of the world and man? Is He the immanent Conservator of the universe--is his omnipotence the _force_, his reason the _law_, and his omnipresence the _life_ of all nature? These are the questions which must be settled before we can successfully deal with the problem of the efficacy of prayer. If we are not agreed on these points, the debate must be adjourned until we have settled the first principles which underlie the discussion. This will be obvious to all who are acquainted with the history of the controversy. If it can be proved that there is no conscious, free, personal God, the creator and conservator of the universe, the question is settled; then prayer can be of no avail, and must "be abandoned to the domain of recognized superstitions." But if it be admitted that there is a God, in the proper import of that term, then the question may be debated whether the Christian doctrine of the efficacy of prayer is consistent with the scientific conception of material nature as "the living garment of God."[426]