The principles which are applicable to the decision of this important question may be best explained, after adverting briefly to some of the particular objections which have been urged against the "efficacy of prayer." Several of these objections evidently proceed on an erroneous view of the nature and object of prayer. When it is said, for example, that God, being omniscient, does not need to be informed either of the wants or the wishes of any of His creatures, the objection involves a great and important truth,—a truth which was explicitly recognized by our Lord when He said, "Your heavenly Father knoweth what things ye have need of before ye ask Him;" but that truth is grievously misapplied when it is directed to prove that prayer is either superfluous or ineffectual, since the objection virtually assumes that the object of prayer is to inform God of what He did not know before, and that His omniscience is of itself sufficient to show that prayer from men or angels must needs be unavailing. When it is said, again, that God being immutable, His will cannot be affected or altered by the "petitions" of His creatures, this objection, like the former one, involves a great and important truth,—a truth which is also explicitly recognized in Scripture when it is said that "He is without variableness or the least shadow of turning;" but this truth, too, is grievously misapplied when it is directed to prove that there can be no efficacy in prayer, since it might as well be said that the Divine dispensations must be invariably the same whatever may be the conduct of His creatures in other respects, as that they must be the same whether men do or do not pray; or, that His procedure as a Moral Governor has no reference whatever either to the character or conduct of his subjects. But, in the words of Dr. Price, "God's unchangeableness, when considered in relation to the exertion of His attributes in the government of the world, consists, not in always acting in the same manner however cases and circumstances alter, but in always doing what is right, and varying His conduct according to the various actions, characters and dispositions of beings. If, then, prayer makes an alteration in the case of the suppliant, as being the discharge of an indispensable duty, what would in truth infer changeableness in Him would be, not His regarding and answering it, but His not doing this."[207] When it is said, again, that there can be no "efficacy in prayer," because there is an established constitution and regular course of Nature, by which all events, whether prosperous or adverse, are invariably determined, and which cannot be altered or modified without a miracle, this objection, like each of the two former, involves an important truth,—a truth which is also explicitly recognized in Scripture when it speaks of "the ordinances of the heavens and the earth," and of the peculiar laws and properties of all created things; but this truth is also grievously misapplied when it is directed to prove that God's will has no efficient control over natural events, or that He has no agencies at His disposal by which he can accomplish the desires of them that seek Him. In all these objections there is an apparent truth, but there is also a latent error; and the false conclusion is founded on an erroneous supposition in regard to the nature and object of prayer.

For this reason, we shall endeavor to separate the truth from the error, and to lay down a few positions which may be established both by reason and Scripture, and which will be sufficient to show that the doctrine which affirms the efficacy of prayer is not only credible, but true.

1. Prayer, in the restricted sense in which we now speak of it, as denoting "petition" or "supplication," consists in offering up "the desires of the heart to God for things agreeable to His will." It is not a mere formal, outward homage, such as might be rendered by words, or ceremonies; it is a spiritual service, in which the mind and heart of man come into immediate converse with God Himself. It is offered to Him personally, as to the invisible but ever-present "Searcher of hearts," who "hears the desire of the humble," and whose "ear is attentive to the voice of their supplications." This implies the recognition of His omnipresence and omniscience, but these perfections of His nature do not supersede the expression of our desires in prayer, just because prayer is designed, not to increase His knowledge, but to declare our sense of dependence on His will, and to procure His grace to help us in every time of need. Our petitions, too, are always bounded within certain limits, and subject to at least one indispensable condition; they are offered only "for things agreeable to His will;" and when our own will is thus, in the very act of prayer, expressly subordinated to that which is alone unerring and supreme, we acknowledge at once His rightful sovereignty and our dutiful subjection, and we are not justly chargeable with the presumption of dictating to God the course of procedure which He should pursue towards us. We are protected, too, against the evils which our own errors in prayer might otherwise entail on us, for "we know not what things to pray for as we ought;" and we have an infallible security that, in the best and highest sense,—that which is most in accordance with our real welfare,—our prayers must be answered, since our wills are resolved into His will; and His will, being omnipotent, cannot be resisted or frustrated in any of its designs. Our assurance of the certain efficacy of our prayers is so much the greater, in proportion as we have reason to believe that the things for which we pray are agreeable to His will; and hence we are more confident in asking spiritual than temporal gifts; for the former we know to be always agreeable to His will and conducive to our own welfare, while the latter may, or may not, be good for us in our present circumstances, and must be left at the sovereign disposal of Him who knows what is in man, and what is best for each of His children.

2. Considering the relation in which we stand to God as His creatures and subjects, it is natural, fit, and proper that we should make known our requests to Him, and supplicate the aids both of His providence and grace; and if it be our duty to pray, it is reasonable to believe that God will have some respect to our prayers in His methods of dealing with us; in other words, that, as a righteous moral governor, he will make a difference between the godly and the ungodly, the men who do, and the men who do not, pray.

In this position it is assumed that there are certain relations, natural or revealed, subsisting betwixt us and God, in virtue of which it is our duty to acknowledge His dominion and our dependence, by supplicating the aids of His providence and grace. That such relations do subsist between God and man, is evinced alike by the light of Nature and of Revelation; and they cannot be discerned or realized without immediately suggesting the idea of certain corresponding obligations and duties. Every one whose conscience has not been utterly seared must instinctively feel the force of that appeal, "If I be a Father, where is mine honor? and if I be a Master, where is my fear?" For, considering God in the very simplest aspect of His character as the Creator and Governor of the world, He stands related to us as the Author and Preserver of our being, as our rightful Proprietor and constant Benefactor, as our supreme Lawgiver, Governor, and Judge; and these natural relations, apart altogether from the supernatural which are revealed in Scripture, are sufficient to lay a solid groundwork for "the duty of prayer" in the case of every intelligent being who is capable of knowing God, and acknowledging his dependence on the Divine will. In such a case, prayer is felt to be a natural, fit, and becoming expression of what is known to be true, and what ought, as a matter of duty, to be practically avowed. Now, this is the grand design of prayer; and in its real design, when that is rightly apprehended, it finds its noblest vindication. The object of prayer is, neither to inform God, as if he were not omniscient, nor to alter His eternal purposes, as if He were not unchangeable, nor to unsettle the established course of Nature, as if He were not "a God of order;" but simply to acknowledge His dominion and our dependence, and to obtain from Him, in the way of His own appointment, the blessings of which we stand in need.

It is not unreasonable to believe that God, as the Governor of the world, will have some regard to the dispositions and actions of His responsible creatures, as a reason for dealing differently with those who own, and those who disown, His supremacy; and that He may require the use of certain means, such as the exercise of prayer, with the view of our obtaining from Him, in a way the most beneficial to ourselves, the blessings, whether temporal or spiritual, of which we stand in need. For if we really be the creatures of God, and, as such, dependent on His providential bounty, and subject to His righteous government, it is self-evidently natural and right that we should, as intelligent and responsible beings, acknowledge His supreme dominion and our absolute dependence by supplicating the aids both of His providence and grace. This is our duty, considering the relations which He sustains towards us; and if it be fit and proper that we should pray to God, if it be, in our circumstances, a duty which we owe to Him, then it is most reasonable to believe that it is equally fit and proper in God to have some respect to our prayers, and to deal with us differently according as we either observe or neglect this religious duty.

Prayer may be regarded in one or other of two distinct aspects: either as a duty, the observance or neglect of which must be followed, under a system of moral government, with different results; or simply as a means, the use of which is productive of certain effects which are made to depend on this special instrumentality. And in either view, its "efficacy" may be affirmed on the same grounds on which we are wont to vindicate the use of all other means, and to enforce the observance of all other duties, in connection with the system of the Divine government.

3. The efficacy of prayer, so far from being inconsistent with, is founded on, the immutability of the Divine purposes and the faithfulness of the Divine promises. God's purposes are justly held, in all other cases, to include the means as well as the ends; and they are often fulfilled through the instrumentality of "second causes." His purpose to provide for the wants of man and beast has reference not merely to the harvest which is the result, but also to the agricultural labor by which, instrumentally, the harvest is prepared. May not "prayer" be also a means ordained by God in the original constitution of the world, a means towards certain ends which are made dependent on its use? If it be such a means, then its "efficacy" is established, in the only sense in which we are concerned to contend for it; while it is shown to be no more inconsistent with the immutability of the Divine purposes, than any other system of means or instruments that may be employed as subordinate agencies in the government of the world. This important view is strikingly illustrated in Scripture. For some of the purposes of God, which might have been undiscoverable in the mere light of Nature, are there explicitly declared; nay, they are thrown into the form of express promises, to which the Divine faithfulness is solemnly pledged; and yet the exercise of prayer, so far from being superseded by these promises, is rather stimulated and encouraged by them; and the believer pleads with increased fervor and confidence when he simply converts God's promises into his own petitions. He feels that in doing so he is taking God at his word; and that his own prayer, in so far as it is warranted by His promise, cannot be ineffectual any more than God's faithfulness can fail.

Thus Daniel "understood by books the number of the years whereof the word of the Lord came to Jeremiah the prophet, that He would accomplish seventy years in the desolation of Jerusalem." He knew the Lord's promise, and that the time for its fulfilment was at hand; yet so far from regarding either the immutability of the Divine purpose, or even the infallible certainty of the Divine promise, as a reason for neglecting prayer, as if that exercise were superfluous or vain, he was stimulated and encouraged to pray just because "he knew the word of the Lord."—"And I set my face," he says, "unto the Lord God, to seek by prayer and supplications, with fasting, sackcloth, and ashes;" and I prayed unto the Lord my God, and said, "O Lord! hear; O Lord! forgive; O Lord! hearken and do; defer not, for thine own sake, O my God!"[208] Thus, again, when the Lord gave certain great and precious promises to His ancient people, assuring them that "He would sprinkle clean water upon them, and give them a new heart and a right spirit," it is added, "I will yet for this be inquired of by the house of Israel to do it for them."[209] Thus, again, when the Saviour himself gave to His disciples that promise, which is emphatically called "the promise of the Father," assuring them that they should be "baptized with the Holy Ghost not many days hence," and directing them to "wait at Jerusalem until they should be endued with power from above," the apostles, so far from regarding that "promise" as superseding the exercise of "prayer," betook themselves immediately to an upper room, and "all continued with one accord in prayer and supplication;" and, at the appointed time, God's promise was fulfilled, and their prayer answered, when "they were all filled with the Holy Ghost, and began to speak with other tongues as the Spirit gave them utterance." These examples are abundantly sufficient to show that prayer, so far from being inconsistent with, is founded on, the immutability of the Divine purposes, and the faithfulness of the Divine promises.

4. Our next position is, that the method in which God answers the prayers of His people may be, in many respects, mysterious or even inscrutable; but no objection to "the efficacy of prayer," which is founded on our ignorance of His infinite resources, can have any weight, especially when there are several hypothetical solutions, any one of which is sufficient to neutralize its force.