An omnipresent, omniscient, and almighty Being, presiding over the affairs of His own world, as the author, upholder, and governor of all things, may well be conceived to have infinite resources at His command,--such as we can never fully estimate,--by which he can give effect to prayer in ways that may be to us inscrutable. But our ignorance of the _mode_ is no reason for doubting the _reality_ of His interposition in answer to prayer; and even if we were unable to decide on the comparative merits of the various explanations of it which have been proposed, the mere fact that there are several solutions, at once conceivable and credible, any one of which may be sufficient, as a hypothetical explanation, to neutralize every adverse presumption, should be held tantamount to a proof that no valid or conclusive objection can be urged against it. Dr. Chalmers has frequently illustrated the legitimate and important uses of "hypothetical solutions" in Theology; and has conclusively shown that even where they leave us at a loss to determine which of various methods of solving a difficulty is the truest or the best, they yet serve a great purpose, if they merely neutralize an objection, by showing that the difficulty in question _might_ be satisfactorily accounted for, were our knowledge more extensive or more precise.[210] Now, with regard to "the efficacy of prayer," there are _four_ distinct solutions, or rather _four_ different methods of disposing of the difficulty, any one of which is sufficient to vindicate the claims of the doctrine on our faith. We shall not discuss the respective merits of these various solutions in detail, but shall merely state them, with the view of showing that there are several methods of accounting for "the efficacy of prayer" in perfect consistency with the established order of Nature.