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6. Thou shalt add days upon days to the king etc. ⁴⁰⁷⁴⁰⁷     In the Chaldee it is: “Thou shalt add days to the days of the King Messiah; his years shall be as the generation of this world, and of the world to come.” David cannot be considered as using these words of gratulation with an exclusive reference to himself. It is true that he lived to an extreme old age, and died full of days, leaving the kingdom in a settled condition, and in the hands of his son, who succeeded him; but he did not exceed the period of one man’s life, and the greater part of it was spent in continued dangers and anxieties. There can be no doubt, therefore, that the series of years, and even ages, of which he speaks, extends prospectively to the coming of Christ, it being the very condition of the kingdom, as I have often remarked, that God maintained them as one people under one head, or, when scattered, united them again. The same succession still subsists in reference to ourselves. Christ must be viewed as living in his members to the end of the world. To this Isaiah alludes, when he says, “Who shall declare his generation or age?” — words in which he predicts that the Church would survive through all ages, notwithstanding the incessant danger of destruction to which it is exposed through the attacks of its enemies, and the many storms assailing it. So here David foretells the uninterrupted succession of the kingdom down to the time of Christ.

7. He shall abide before the face of God for ever. This is only a simpler way of expressing what he had said before, I will abide in thy tabernacle for ever. He refers to the security and peace which he would enjoy under the protection of God, who would effectually preserve his life. By the face of God, must be meant the fatherly care and providence which he extends to his people. So numerous are the dangers which surround us, that we could not stand a single moment, if his eye did not watch over our preservation. But the true security for a happy life lies in being persuaded that we are under divine government. There follows a prayer that God would appoint mercy and truth for preserving the king. And this admits of two meanings. As clemency and truth are the best safeguards of a kingdom, it would not be altogether unreasonable to suppose that David prays here to be endued with these dispositions, as a means of establishing his throne. But the other meaning is perhaps preferable, that God would gird himself with clemency and truth in order to the preservation of the king. The Hebrew term מנה, manah, signifies not only to prepare, but to set over, or appoint; and he speaks as if the true defense of the kingdom was only to be found in the mercy and faithfulness of God. He uses the expression prepare, or command, to intimate how easily God can provide the means necessary for preserving his people. In the concluding words, he expresses his resolution to persevere in the constant celebration of the praises of God, with a view to fulfilling the vows which he had contracted — and this again may lead us to remark the agreement which ought ever to subsist between the two parts of invocation: for David, while he applied to God for help, under the pressure of calamity, showed himself uniformly grateful when he had experienced deliverance.