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Dr. Doddridge was one day walking, much depressed, his very heart desolate within him. But, says he, passing a cottage door open, I happened at that moment to hear a child reading, "As thy days, so shall thy strength be." The effect on my mind was indescribable. It was like life from the dead. And what does this word say to us? "As thy days, so shall thy strength be." There is strength bodily. The continuance of this is a mercy. How easily can it be crushed, so that we may be made to possess months of vanity; and endure wearisome nights; and feel every exertion a difficulty, and every duty a burden! But there is strength spiritual. This is very distinguishable from the former, and often found separate from it. The Lord does not always give His people a giant's arm, or an iron sinew; but His strength is made perfect in weakness. This is the strength here spoken of. For two purposes His people will find it necessary: service and suffering. Every Christian has a course of duty common to him as a man; which is, to provide for his outward wants, and the support of his family. And this is done by labour, in which he is required not to be slothful. But there is a series of duties pertaining more immediately to him in his religious character; to believe, to pray, to deny ungodliness and worldly lusts, and to live soberly, righteously, and godly in the present evil world. Suffering is commonly connected with service in the Divine life. It was so invariably in the beginning of the Gospel. Then it was deemed impossible for anyone to live godly in Christ Jesus and not suffer persecution. Therefore, no sooner was Paul converted, than he was told how great things he had to suffer. As real religion is always the same, some degree of the same opposition may be always looked for; and the hatred of the world will be shown as far as they have liberty to express it, and are not restrained by law, or the usages of civilised life. But when the Christian has rest from such trials as these, God can subserve their purpose, by personal and relative afflictions, which are often severer than even the endurings of a martyr. They are called chastenings and rebukes which he is neither to despise, nor faint under. Now the prospect of all this, when he looks forward into life, is enough to awaken the Christian's anxiety; and nothing can effectually encourage him but the discovery of strength equal to his exigencies. And this he finds not in himself. The natural man has no sensibility of his weakness, because he is not earnestly engaged in those applications which require spiritual strength. The Christian is. He knows that he is as destitute of strength as he is of righteousness. He feels himself entirely insufficient for all the duties and trials of the Divine life. And the consciousness, instead of diminishing, grows with the experience of every day. And he need not be afraid of this. Rather, let him cherish it; for when he is weak, then is he strong. What he wants is provided and ensured by the promise of a God who cannot lie.

(W. Jay.)

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KJV: Thy shoes shall be iron and brass; and as thy days, so shall thy strength be.

WEB: Your bars shall be iron and brass. As your days, so your strength will be.