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34 My covenant will I not break. As the true knowledge of God’s mercy can only be obtained from his word, he enjoins us to keep our eyes intently fixed upon his covenant. The more excellent and invaluable a blessing it is, “Never to be rejected after having been once adopted by him,” the more difficult it is for us to believe its truth. And we know how many thoughts from time to time present themselves to our minds, tempting us to call it in question. That the faithful, therefore, may not harass themselves beyond measure in debating in their own minds whether or no they are in favor with God, they are enjoined to look to the covenant, and to embrace the salvation which is offered to them in it. God here commends to us his own faithfulness, that we may account his promise sufficient, and that we may not seek the certainty of our salvation any where else. He had said above, If the children of David break my statutes; and now, alluding to that breach, he declares that he will not requite them as they requite him, My covenant will I not break, implying, that although his people may not altogether act in a manner corresponding to their vocation, as they ought to do, he will not suffer his covenant to be broken and disannulled on account of their fault, because he will promptly and effectually prevent this in the way of blotting out their sins by a gratuitous pardon. He is still pursuing the illustration of the preceding proposition, I will not suffer my faithfulness to fail; promising not only to be faithful on his side, as we say, but also that what he has promised shall take full effect, in despite of all the impediments which men may cast in the way; for he will strive against their sins, that by means of them the fruit of his goodness may not be prevented from reaching them. When the Jews, by their ingratitude and treachery, revolted from him, the covenant was not disannulled, because it was founded upon the perfect immutability of his nature. And still, at the present day, when our sins mount even to the heavens, the goodness of God fails not to rise above them, since it is far above the heavens.

35. Once have I sworn by my holiness. God now confirms by an oath what he previously stated he had promised to David; from which it appears that it was not a matter of small importance; it being certain that God would not interpose his holy name in reference to what was of no consequence. It is a token of singular loving-kindness for him, upon seeing us prone to distrust, to provide a remedy for it so compassionately. We have, therefore, so much the less excuse if we do not embrace, with true and unwavering faith, his promise which is so strongly ratified, since in his deep interest about our salvation, he does not withhold his oath, that we may yield entire credence to his word. If we do not reckon his simple promise sufficient, he adds his oath, as it were, for a pledge. The adverb once, ⁵⁵¹⁵⁵¹     “Par lesqnels moyens ils ont pensé se racheter pour eschapper la main et vengence de Dieu.” — Fr. denotes that the oath is irrevocable, and that therefore we have not the least reason to be apprehensive of any inconstancy. He affirms that he sware by his holiness, because a greater than himself is not to be found, by whom he could swear. In swearing by Him, we constitute him our judge, and place him as sovereign over us, even as he is our sovereign by nature. It is a more emphatic manner of expression for him to say, by my holiness, than if he had said, by myself, not only because it magnifies and exalts his glory, but also because it is far more fitted for the confirmation of faith, calling back, as it does, the faithful to the earthly habitation which he had chosen for himself, that they might not think it necessary for them to seek him at a distance; for by the term holiness, I have no doubt, he means the sanctuary. And yet he swears by himself, and by nothing else; for, in naming the temple which he had appointed as his seat, he does not depart from himself; but, merely accommodating his language to our rude understandings, swears by his holiness which dwells visibly upon earth. With respect to the elliptical form of the oath, we have seen, in a previous psalm, that this was a manner of swearing quite common among the Hebrews. Thus they were warned that the name of God was not to be used without due consideration, lest, by using it rashly and irreverently, they should draw down upon themselves the Divine vengeance. The abrupt and suspended form of expression was, as it were, a bridle to restrain them, and give them opportunity for reflection. It is no uncommon thing for God to borrow something from the common custom of men.

36. His seed shall endure for ever. There now follows the promise that the right of sovereignty shall always remain with the posterity of David. These two things — his offspring and his throne, are conjoined; and by these words the everlasting duration of the kingdom is promised, so that it should never pass to those who were of a strange and different race. The sun and the moon are produced as witnesses; for although they are creatures subject to corruption, they yet possess more stability than the earth or air; the elements, as we see, being subject to continual changes. As the whole of this lower world is subject to unceasing agitation and change, there is presented to us a more steadfast state of things in the sun and moon, that the kingdom of David might not be estimated according to the common order of nature. Since, however, this royal throne was shaken in the time of Rehoboam, as we have before had occasion to remark, and afterwards broken down and overthrown, it follows that this prophecy cannot be limited to David. For although at length the outward majesty of this kingdom was put an end to without hope of being re-established, the sun ceased not to shine by day, nor the moon by night. Accordingly, until we come to Christ, God might seem to be unfaithful to his promises. But in the branch which sprung from the root of Jesse, these words were fulfilled in their fullest sense. ⁵⁵²⁵⁵²     “Once. Emphatic. It needs not to be repeated: nor will be.” — Walford.