This chapter consists of four parts. I. Some general observations necessary for the understanding of the subject are made by way of preface, sec. 1–5. II. Three things always to be attended to in ascertaining and expounding the meaning of the Moral Law, sec. 6–12. III. Exposition of the Moral Law, or the Ten Commandments, sec. 13–15. IV. The end for which the whole Law is intended—viz. to teach not only elementary principles, but perfection, sec. 51, to the end of the chapter.
1. The Law was committed to writing, in order that it might teach more fully and perfectly that knowledge, both of God and of ourselves, which the law of nature teaches meagrely and obscurely. Proof of this, from an enumeration of the principal parts of the Moral Law; and also from the dictate of natural law, written on the hearts of all, and, in a manner, effaced by sin
1. I believe it will not be out of place here to introduce the Ten Commandments of the Law, and give a brief exposition of them. In this way it will be made more clear, that the worship which God originally prescribed is still in force (a point to which I have already adverted); and then a second point will be confirmed—viz. that the Jews not only learned from the law wherein true piety consisted, but from feeling their inability to observe it were overawed by the fear of judgments and so drawn, even against their will, towards the Mediator. In giving a summary of what constitutes the true knowledge of God,1 we showed that we cannot form any just conception of the character of God, without feeling overawed by his majesty, and bound to do him service. In regard to the knowledge of ourselves, we showed that it principally consists in renouncing all idea of our own strength, and divesting ourselves of all confidence in our own righteousness, while, on the other hand, under a full consciousness of our wants, we learn true humility and self-abasement. Both of these the Lord accomplishes by his Law, first, when, in assertion of the right which he has to our obedience, he calls us to reverence his majesty, and prescribes the conduct by which this reverence is manifested; and, secondly, when, by promulgating the rule of his justice (a rule, to the rectitude of which our nature, from being depraved and perverted, is continually opposed, and to the perfection of which our ability, from its infirmity and nervelessness for good, is far from being able to attain), he charges us both with impotence and unrighteousness. Moreover, the very things contained in the two tables are, in a manner, dictated to us by that internal law, which, as has been already said, is in a manner written and stamped on every heart. For conscience, instead of allowing us to stifle our perceptions, and sleep on without interruption, acts as an inward witness and monitor, reminds us of what we owe to God, points out the distinction between good and evil, and thereby convicts us of departure from duty. But man, being immured in the darkness of error, is scarcely able, by means of that natural law, to form any tolerable idea of the worship which is acceptable to God. At all events, he is very far from forming any correct knowledge of it. In addition to this, he is so swollen with arrogance and ambition, and so blinded with self-love, that he is unable to survey, and, as it were, descend into himself, that he may so learn to humble and abase himself, and confess his misery. Therefore, as a necessary remedy, both for our dullness and our contumacy, the Lord has given us his written Law, which, by its sure attestations, removes the obscurity of the law of nature, and also, by shaking off our lethargy, makes a more lively and permanent impression on our minds.
2. Certain general maxims. 1. From the knowledge of God, furnished by the Law, we learn that God is our Father and Ruler. Righteousness is pleasing, iniquity is an abomination in his sight. Hence, how weak soever we may be, our duty is to cultivate the one, and shun the other
2. It is now easy to understand the doctrine of the law—viz. that God, as our Creator, is entitled to be regarded by us as a Father and Master, and should, accordingly, receive from us fear, love, reverence, and glory; nay, that we are not our own, to follow whatever course passion dictates, but are bound to obey him implicitly, and to acquiesce entirely in his good pleasure. Again, the Law teaches, that justice and rectitude are a delight, injustice an abomination to him, and, therefore, as we would not with impious ingratitude revolt from our Maker, our whole life must be spent in the cultivation of righteousness. For if we manifest becoming reverence only when we prefer his will to our own, it follows, that the only legitimate service to him is the practice of justice, purity, and holiness. Nor can we plead as an excuse, that we want the power, and, like debtors, whose means are exhausted, are unable to pay. We cannot be permitted to measure the glory of God by our ability; whatever we may be, he ever remains like himself, the friend of righteousness, the enemy of unrighteousness, and whatever his demands from us may be, as he can only require what is right, we are necessarily under a natural obligation to obey. Our inability to do so is our own fault. If lust, in which sin has its dominion, so enthrals us, that we are not free to obey our Father, there is no ground for pleading necessity as a defence, since this evil necessity is within, and must be imputed to ourselves.