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We generally hear these words misquoted, and put into the shape, "As thy day, so shall thy strength be," as if the substance of the promise was strength proportioned to the special exigencies of each movement. That is very beautiful, and may well be deduced from the words, but it fails to take into account that little "s" at the end of the word "day," which obliges us to understand the promise as meaning: "As thy days" (increase) "thy strength shall" (increase). The older a Christian is, the stronger Christian he Ought to be. Then there is another thing to be noted, and that is that in their original connection the words are a promise, not to an individual, but to a community. It is the last of the series of promises to the various tribes of Israel which occupy this chapter of Deuteronomy.

I. INCREASE OF STRENGTH WITH INCREASE OF AGE. In its application to the individual life. Here is a promise dead in the teeth of nature, because all living things that belong to the material universe come under the law of growth, which ultimately passes into decay. The same sea of Time that flings up its spoils on some shores, and increases the land, when you get round the promontory is eating away the coast. And so, the years, which at first bring us strength, very soon begin to reverse their action. Nor is it only the physical life which dwindles as the days increase, but also much of the inner life is modified by the external, so that the old man's memory becomes less retentive, and the old man's impulses less strong. But "as thy days, so shall thy strength be," and when the eyes become dim, it is possible that they may be longer sighted, and see the things that are, just in proportion as they begin to fail to see "the things that do appear." They may be able to discern more clearly what is above them, as they see less clearly the things on their own level. It is possible that as the days increase, and the strength drawn from externals decreases, the power of the Spirit, the maturity of the soul, the insight into the Eternal, the Christ. likeness and assimilation to that which we more clearly behold, as the clouds thin themselves away, may all increase. And so, in all that makes the Christian life, it is possible that there shall be increase with the increase of our days. Why so? Just because the Christian life is a supernatural life that has nothing to do with dependence on physical conditions. If it were not so, if my Christian vitality stood exactly on the same plane as my vigour of intellect, my retentiveness of memory, my energy of purpose, or other capacities, which make up the non-material part of my being — the "soul," as people call it — then it, too, would share in the decrepitude and decay. We sometimes see people, in the measure in which their physical strength decays, drawing into themselves more and more of that supernatural and Divine strength which has nothing to do with the material or the external. Is that not a reason for believing that that life which thus obeys a law, as I said, dead in the teeth of nature, is a life altogether independent of this bodily existence, and our connection with this material universe? There is no better proof of immortality, if you except the fact of the resurrection, than the way in which, right up to the edge of the grave, and even when a man's foot is on its threshold, there burns in his soul, brighter and brightening as the darkness falls, all that makes the Christian life. But if this contradiction of nature by a supernatural life is to be ours, as it may be, let us not forget that this promise, like all God's promises, is a promise with conditions. They are not stated here, but we know them. "The youths shall faint and be weary; the young men shall utterly fall; but they that wait on the Lord shall renew their strength" — they, and only they. God does not give gifts to men who He sees are wasting them, and the gift of growing strength that is promised to us is strength that is to be used for His service. Has my strength grown with years? Let me say one word, and it shall be but a word, about the other application of this great thought. As I said, it is a tribal benediction, and all the benedictions of all the tribes have passed over to the great community of New Testament believers. The Church is heir to the Divine promise that as its days increase its strength increases. And though, of course, there have been fearful instances to the contrary, and churches, like other institutions, are apt to stiffen and decay in their old age, yet the only institution in the world that has lasted so long, and kept up so much vitality through centuries, is the Christian Church. Why? If there were not a supernatural life in it, it would have been dead long ago. "As the Church's days increase, so will her strength grow." But the promise of our text is susceptible of another application, though that is not its true signification, and may be taken as meaning the necessities of the days shall determine the nature of the strength given. And that adaptation of supply to need will be true in many directions. It will be true if we consider the tasks imposed by each succeeding day. For God never sets His servants to work or warfare beyond the limits of the strength which they have or may have, if they will. Again, this adaptation will shape the day's strength according to the day's wants. The "matter of a day in its day" will be given. There will be daily bread for daily hunger. God makes no mistakes, sending furs for June or muslin for December. His gifts are never belated, nor arrive after the need for them is past. That adaptation takes effect for us on the same condition as the increase does, of which we have been speaking, namely, on condition of our waiting on God.

(A. Maclaren, D. D.)

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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.