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13. Thou shalt arise, and have mercy upon Zion. We have here the conclusion drawn from the truth stated in the preceding verse — God is eternal, and therefore he will have compassion upon Zion. God’s eternity is to be considered as impressed upon the memorial, or word, by which he has brought himself under obligation to maintain our welfare. Besides, as he is not destitute of the power, and as it is impossible for him to deny himself, we ought not to entertain any apprehension of his failing to accomplish, in his own time, what he has promised. We have observed, in another place, that, the verb to arise refers to what is made apparent to the eye of sense; for although he continues always immutable, yet, in putting forth his power, he manifests his majesty by the external act, as it is termed.

When the prophet treats of the restoration of the Church, he sets forth the divine mercy as its cause. He represents this mercy under a twofold aspect, and therefore employs different words. In the first place, as in the matter under consideration, the good deserts of men are entirely out of the question, and as God cannot be led from any cause external to himself to build up his Church, the prophet traces the cause of it solely to the free goodness of God. In the second place, he contemplates this mercy as connected with the Divine promises. Thou shalt have mercy upon Zion, for the time appointed, according to thy good pleasure, is come Meanwhile, it is to be observed that, in magnifying the Divine mercy, his design was to teach true believers that their safety depended on it alone. But we must now attend to what time is alluded to. The word מועד, moed, signifies all kind of fixed or appointed days. There is, then, beyond all doubt, a reference to the prophecy of Jeremiah, recorded in Jeremiah 29:10, and repeated in the last chapter of the Second Book of Chronicles, at the 21st verse. That the faithful might not sink into despondency, through the long continuance of their calamities, they needed to be supported by the hope that an end to their captivity had been appointed by God, and that it would not extend beyond seventy years. Daniel was employed in meditating on this very topic, when “he set his face unto the Lord God, to seek, by prayer and supplications,” the re-establishment of the Church, (Daniel 9:2) In like manner, the object now aimed at by the prophet was to encourage both himself and others to confidence in prayer, putting God in mind of this remarkable prophecy, as an argument to induce him to bring to a termination their melancholy captivity. And surely if, in our prayers, we do not continually remember the Divine promises, we only cast forth our desires into the air like smoke. It is, however, to be observed, that although the time of the promised deliverance was approaching, or had already arrived, yet the prophet does not cease from the exercise of prayer, to which God stirs us up by means of his word. And although the time was fixed, yet he calls upon God, for the performance of his covenant, in such a manner, as that he is still betaking himself to his free goodness alone; for the promises by which God brings himself under obligation to us do not, in any degree, obscure his grace.