From the manner of this announcement, we may derive instruction. It is not necessary that we should enter into a formal demonstration that God exists, or a formal investigation of his attributes, before we begin the duty of loving him. We already know enough of him for this; and to postpone the performance of the duty until we have completed our investigations, is to commence them with unsanctified hearts, and in rebellion against God. From the dawn of our being we have had demonstrations of God's existence and character, blazing around us like the light of noonday. The heavens and the earth have declared his glory; his ministers and people have proclaimed his name; he is not to us an unknown God, except so far as our minds are wilfully blind to the displays of his glory. If, therefore, we withhold the affections of our hearts, we can have no excuse in the plea that more evidence is needed. And with hearts so alienated from God at the outset, all our religious inquiries are likely to be unprofitable. What probability is there that further proof will produce its proper impression and effect on our minds, if that which is already in our possession is unheeded or abused? If, from what we already know of God, we admire and love him, we shall desire to know more of him, and shall prosecute the study with profit and delight; but, if we have already shut him out of our hearts, all our intellectual investigations respecting him may be expected to leave us in spiritual blindness.

The duty required corresponds, in character, to the religion, of which it is an essential part. Heathen gods could not claim the supreme love of their worshippers; and heathen minds had no idea of a religion founded on supreme love to their deities. To some extent, they were objects of fear; and much that appertained to their supposed character and history, served for amusement, or to interest the imagination; but the conduct attributed to them was often such as even heathen virtue disapproved. Hence, they could not be objects of supreme love; and no one claimed it for them. The requirement of supreme love demonstrates the religion of the Bible to be from the true God; and when we begin our religious investigations with the admission of the obligation, and the full recognition of it in out hearts, we may be assured that we are proceeding in the right way.

The simplicity of the requirement is admirable. No explanation of the duty is needed. Forms of worship may be numerous and various, and questions may arise as to the forms which will be most acceptable. Many outward duties of morality are often determined with much difficulty. Perplexing questions arise as to the nature of repentance and faith, and the uninformed need instruction respecting them. But no one needs to be told what love is; the humblest mind can understand the requirement, and may feel pleasure in the consciousness of rendering obedience to it; and the learned philosopher stands in the presence of this precept as a little child, and feels it power binding every faculty that he possess. This simple principle pervades all religion, and binds all intelligences, small and great, to God, the centre of the great system. Between it and the power of gravitation in the natural world, which binds atoms and masses, pebbles and vast planets, a beautiful analogy may be traced.

The comprehensiveness of the precept is not less admirable. From it rises the precept, Love thy neighbor as thyself; and on these two all the law rests. We love our neighbors because they are God's creatures, and the subjects of his government, and because he has commanded us. We love God supremely, because he is the greatest and best of beings; and we love other beings, according to the importance of each in the universal system of being. One principle pervades both precepts, as one principle of gravitation binds the earth to the sun, and the parts of the earth to each other. This law binds angels to the throne of God, and to each other; and binds men and angels together, as fellow-subjects of the same sovereign. The decalogue is this law expanded, and adapted to the condition and relations of mankind. Love is not only the fulfilling of the law, but it is also the essence of gospel morality. All Christian obedience springs from it; and, without it, no form of obedience is acceptable to God. He who loves God supremely, cannot be guilty of that unbelief which makes God a liar, and he cannot reflect on the sins which he has committed against God, without sincere penitence.

We must not overlook the tendency of this precept to produce universal good. Every one knows how much the order and happiness found in human society, depend on love. If all kind affections were banished from the hearts of men, earth would be converted at once into a pandemonium. What love is left on earth renders it tolerable, and the love which reigns in heaven makes it a place of bliss. Perfect obedience to the great law of love is sufficient to render all creatures happy. It opens, within the breast, a perennial source of enjoyment; and it meets, from without, the smile and blessing of an approving God.

Though the religion of love is clearly taught in the book of God only, yet, when we have learned it there, we can discover its agreement with natural religion. It will be useful to observe how the moral tendencies of our nature accord, on this point, with the teachings of revelation.

The wickedness of man has been a subject of complaint in all ages. The ancient heathen complained of the degeneracy of their times, and talked of a golden age, long passed, in which virtue prevailed. In modern heathen nations, together with the depravity that prevails, some sense of that depravity exists; and everywhere the necessity or desirableness of a more virtuous state of society is admitted. In Christian lands, the very infidels, who scoff at all religion with one breath, will, with the next, satirize the wickedness of mankind. It is the united judgment of every nation, and every age, that the practice of men falls below their own standard of virtue. It is, therefore, necessary, in order to acquire the best notions of virtue that nature can give us, to turn away from the practice of men to those moral sentiments implanted in the human breast, which condemn this practice, and urge to higher virtue.

It is well known that men judge the actions of others with more severity than their own. Our appetites and passions interfere with the decisions of conscience, when our own conduct is the subject of examination. Hence, the general moral sense of mankind is a better standard of virtue than the individual conscience. In looking to the judgment of others, with a view to determine the morality of our actions, the judgment of those is especially to be regarded who are to be benefited or injured by our deeds. Hence, natural religion approves the rule - Do unto others as you would, in like circumstances, that they should do unto you. When the vice of others interferes with our happiness, we are then most keenly sensible of its existence and atrocity. However vague our notions of virtue may be, we always conceive of it as tending to promote the happiness of others. Yet it is not every tendency to promote happiness which we conceive to be virtuous. The food that we eat, and the couch on which we lie, tend to promote our happiness; yet we do not ascribe virtue to these inanimate things. Virtue belongs only to rational and moral agents; and the promotion of happiness must be intentional to be accounted virtuous. There is still another limitation. Men sometimes confer benefits on others, with the expectation of receiving greater benefits in return. Where the motive for the action is merely the benefit expected in return, the common judgment of mankind refuses to characterize the deed as virtuous. To constitute virtue, there must be an intentional promotion of happiness in others; and this intention must be disinterested. Natural religion does not deny that a higher standard of morality may exist; but it holds that disinterested benevolence is virtue, and it determines that morality of actions by the disinterested benevolence which they exhibit.

Some have maintained that self-love is the first principle of virtue, its central affection, which spreading first to those most nearly related to us, extends gradually to others more remote, and widens at length into universal benevolence. This system of morality is self-contradictory. While it claims to aim at universal happiness, it makes it the duty of each individual to aim, not at this public good, but at this own private benefit. Whenever the interest of another comes in conflict with his own, it is made his duty to aim at the latter, and to promote that of his neighbor only so far as it may conduce to his own. It is true, that the advocates of this system bring in reason as a restraining influence, and suppose that it will so regulate the exercise of self-love as to result in the general good. According to this system, if we, in aiming at our own happiness, practise fraud and falsehood with a view to promote it, and find ourselves defeated in the attainment of our object, we may charge our failure, not on the virtuous principle by which it is assumed that we have been moved, but on the failure of our reason to restrain and regulate it so as to attain its end. If it be said, that conscience will not permit us to be happy in the practise of fraud and falsehood, and that self-love, aware of this avoids those practices so inconsistent with our internal peace, it is clearly admitted that conscience is a higher principle of our nature, to the decisions of which our self-love is compelled to yield.

As virtue aims at the general good, it must favour the means necessary for the attainment of this end. Civil government and laws, enacted and executed in wisdom and justice, are highly conducive to the general welfare, and these receive the approbation and support of the virtuous. Were an individual of our race, by a happy exception to the general rule, born with a virtuous bias of the mind, instead of the selfish propensity natural to mankind; and were this virtuous bias fostered and developed in his education, he would be found seeking the good of all. His first benefits conferred, would be on those nearest to him; but his disinterested benevolence would not stop here. As his acquaintance extended into the ramifications of society, his desire and labour for the general good would extend with it, and civil government, wholesome laws, and every institution tending to public benefit, would receive his cordial approbation and support; and every wise and righteous governor, and every subordinate individual, aiming at the public good, would be an object of his favour. If we suppose the knowledge of this individual to increase, and his virtuous principles to expand, widening the exercise of universal benevolence; and if, at length, the idea of a God, a being of every possible moral excellence, the wise and righteous governor of the universe, should be presented; how would his heart be affected? Here his virtuous principles would find occasion for their highest exercise, and would have the highest place in his admiration and love; and the discovery of his universal dominion would produce ineffable joy. Such are the affections of heart which even natural religion teaches, that the knowledge of God's existence and perfections ought to produce.

In God's written Word, we learn our duty in a reverse method. We are not left to trace it out by a slow process, beginning with the first exercise of moral principle in the heart, and rising at length to the infinite God; but the existence and character of God are immediately presented, and the first and chief of all duties is at once announced: "Thou shalt love the Lord thy God with all thy heart." How sublime! how appropriate! The virtuous mind is open to receive such a revelation; and its perfect accordance with the best teachings of natural religion, recommends it to our understandings and our hearts. The second commandment, "Thou shalt love thy neighbor as thyself," is introduced, not as leading to the first, but as subordinate to it. It takes the place which properly belongs to it in a revelation from the supreme authority.

Love has been divided into benevolence, beneficence, and complacence. This division may at first appear inconsistent with the simplicity which has been ascribed to love. Benevolence is the disposition to do good to an object, and beneficence is the conferring of that good. The latter is not properly love, but the effect or manifestation of it. On the other hand, complacence includes the cause of the love together with the affection itself. Love may be exercised toward an unworthy object, as when God loves those who are dead in trespasses and sins. But it may be exercised toward those whose moral character renders them fit objects. In this case, the love being connected with approbation of the character beloved, is called complacence. When love has an inanimate thing for its object, as when Isaac loved savory meat, the term refers to the deriving of enjoyment; but when the object of love is a sentient being, the term always implies the conferring of enjoyment even when some pleasure has been received, or some enjoyment in return is expected.

Love to God implies cordial approbation of his moral character. His natural attributes, eternity, immensity, omnipotence, &c, may fill us with admiration; but these are not the proper objects of love. If we worship him in the beauty of holiness, the beauty of his holiness must excite the love of our hearts. As our knowledge of these moral perfections increases, our delight in them must increase; and this delight will stimulate to further study of them; and to a more diligent observation of the various methods in which they are manifested. The display of them, even in the most terrible exhibitions of his justice, will be contemplated with reverent, but approving awe; and their united glory, as seen in the great scheme of redemption by Christ, will be viewed with unmixed and never-ceasing delight.

Love to God includes joy in his happiness. He is not only perfectly holy, but perfectly happy; and it is our duty to rejoice in his happiness. In loving our neighbor, we rejoice in his present happiness, and desire to increase it. We cannot increase the already perfect happiness of God, but we can rejoice in that which he possesses. If we delight in the happiness of God, we shall labor to please him in all things, to do whatever he commands, and to advance all the plans, the accomplishment of which he has so much at heart. Love, therefore, includes obedience to his commands, and resignation and submission to his will.

Love to God will render it a pleasing task to examine the proofs of his existence, and to study those glorious attributes which render him the worthy object of supreme affection. Let us enter on this study, prompted by holy love, and a strong desire that our love may be increased.