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When we have seen the hills clad with verdure to their summit, and the seas laving their base with a silver glory; when we have stretched our eye far away, and have seen the widening prospect full of loveliness and beauty, we have felt sad that the sunlight should ever set upon such a scene, and that so much beauty should be shrouded in the oblivion of darkness. But how much reason have we to bless God for nights! for if it were not for nights how much of beauty never would be discovered. Night seems to be the great friend of the stars: they must be all unseen by eyes of men, were they not set in the full of darkness. It is even so with winter. Much of God's marvellous miracles of hoar frost must have been hidden from us, if it had not been for the cold chill of winter, which, when it robs us of one beauty, gives us another, — when it takes away the emerald of verdure, it gives us the diamond of ice — when it casts from us the bright rubies of the flowers, it gives us the fair, white ermine of snow. Well now, translate those two ideas, and you will see why it is that even our sin, our lost and ruined estate, has been made the means, in the hand of God, of manifesting to us the excellencies of His character. If you and I had been without trouble, we never could have had such a promise as this given to us — "As thy days, so shall thy strength be."

I. THE SELF-WEAKNESS HINTED AT IN THE TEXT. To keep to my figure, if this promise be like a star, you know there is no seeing the stars in the daytime when we stand here upon the upper land; we must go down a deep well, and then we shall be able to discover them. Now, as this is daytime with our hearts, it will be necessary for us to go down the deep well of old recollections of our past trials. We must first get a good fair idea of the great depth of our own weakness, before we shall be able to behold the brightness of this rich and exceeding precious promise.

1. Ye children of God, have ye not proved your own weakness in the day of duty? The Lord has spoken to you, and He has said, "Son of man, run, and do such and such a thing which I bid thee"; and you have gone to do it, but as you have been upon your way, a sense of great responsibility has bowed you down, and you have been ready to turn back even at the outset, and to cry, "Send by whomsoever Thou wilt send, but not by me." Reinforced by strength, you have gone to the duty, but while performing it, you have at times felt your hands hanging exceeding heavy, and you have had to look up many a time and cry, "O Lord, give me more strength, for without Thy strength this work must be unaccomplished; I cannot perform it myself." And when the work has been done, and you have looked back upon it, you have either been filled with amazement that it should have been done at all by so poor and weak a worm as yourself, or else you have been overcome with horror because you have been afraid the work was marred, like the vessel on the potter's wheel, by reason of your own want of skilfulness.

2. We prove our weakness, perhaps more visibly, when we come into the day of suffering. There it is that we are weak indeed. Ah! people of God, it is one thing to talk about the furnace; it is another thing to be in it. It is one thing to look at the doctor's knife, but quite another thing to feel it. That man has never been sick who does not know his weakness, his want of patience, and of endurance.

3. Again, there is another thing which will very soon prove our weakness, if neither duty nor suffering will do it — namely, progress. Let any of you try to grow in grace, and seek to run the heavenly race, and make a little progress, and you will soon find, in such a slippery road as that which we have to travel, that it is very hard to go one step forward, though remarkably easy to go a great many steps backward.

4. See what thou art in temptation. I have seen a tree in the forest that seemed to stand fast like a rock; I have stood beneath its wide-spreading branches, and have sought to shake its trunk, to see if I could, but it stood immovable. The sun shone upon it, and the rain descended, and many a winter's frost sprinkled its boughs with snow, but it still stood fast and firm. But one night there came a howling wind which swept through the forest, and the tree that seemed to stand so fast lay stretched along the ground, its gaunt arms which once were lifted up to heaven lying hopelessly broken, and the trunk snapped in twain. And so have I seen many a professor strong and mighty, and nothing seemed to move him; but I have seen the wind of persecution and temptation come against him, and I have heard him creak with murmuring, and at last have seen him break in apostasy and he has lain along the ground a mournful specimen of what every man must become who maketh not the Lord his strength, and who relieth not upon the Most High. We have all our tender points. When Thetis dipped Achilles in the Styx, you remember she held him by the heel; he was made invulnerable wherever the water touched him, but his heel not being covered with the water, was vulnerable, and there Paris shot his arrow, and be died. It is even so with us. We may think that we are covered with virtue till we are totally invulnerable, but we have a heel somewhere; there is a place where the arrow of the devil can make way: hence the absolute necessity of taking to ourselves "the whole armour of God," so that there may not be a solitary joint in the harness that shall be unprotected against the arrows of the devil.

II. THE GREAT PROMISE — "As thy days, so shall thy strength be."

1. This is a well-guaranteed promise. There is enough bullion in the vaults of Omnipotence to pay off every bill that ever shall be drawn by the faith of man or the promises of God. Now look at this one "As thy days, so shall thy strength be." God has a strong reserve with which to pay off this promise; for is He not Himself omnipotent, able to do all things? Remember what He did in the days of old, in the former generations. Remember how He spake, and it was done; how He commanded, and it stood fast. He hangeth the world upon nothing; He fixed the pillars of heaven in silver sockets of light, and thereon He hung the golden lamps, the sun and the moon; and shall He that did all this be unable to support His children? Shall He be unfaithful to His word for want of power in His arm or strength in His will? Remember again, thy God, who has promised to be thy strength, is the Cod who upholdeth all things by the word of His hand. Who feedeth the ravens? Who supplies the lions? Doth not He do it? And how? He openeth His hand and supplieth the want of every living thing. He has to do nothing more than simply to open His band. Who is it that restrains the tempest? Doth not He say that He rides upon the wings of the wiled, that He maketh the clouds His chariots, and holds the water in the hollow of His hand? Shall He fail thee?

2. It is a limited promise. "What!" says one, "limited! Why it says, 'As thy days, so shall thy strength be.'" Ay, it is limited. I know it is unlimited in our troubles, but still it is limited. First, it says our strength is to be as our days are; it does not say our strength is to be as our desires are. Oh! how often have we thought, "How I wish I were as strong as So-and-so" — one who had a great deal of faith. Ah! but then you would have rather more faith than you wanted; and what would be the good of that? "Still," says one, "if I had faith like So-and-so, I think I should do wonders." Yes, but you would get the glory of them. God does not want you to do wonders. That is reserved for God, not for you, — "He only doeth wondrous things." Once more, it does not say, our strength shall be as our fears God often leaves us to shift alone with our fears, — never with our troubles. The promise is "As thy days, so shall thy strength be." "When your vessel gets empty then will I fill it; I will not give you any extra, over and above. When you are weak then I will make you strong; but I will not give you any extra strength to lay by: strength enough to bear your sufferings, and to do your duty; but no strength to play at matches with your brethren and sisters in order to get the glory to yourselves." Then, again, there is another limit. It says, "As thy days, so shall thy strength be." It does not say, "as thy weeks," or "months" but "as thy days." You are not going to have Monday's grace given you on a Sunday, nor Tuesday's grace on a Monday. No; "as thy days, so shall thy strength be."

3. What an extensive promise this is! "As thy days, so shall thy strength be." Some days are very little things; in our pocket book we have very little to put down, for there was nothing done of any importance. But some days are very big days. Ah! I have known a big day — a day of great duties, when great things had to be done for God — too great, it seemed, for one man to do; and when great duty was but half done there came great trouble, such as my poor heart had never felt before. Oh! what a great day it was! there was a night of lamentation in this place, and the cry of weeping, and of mourning, and of death. Ah! but blessed be God's name, though the day was big with tempest, and though it swelled with horror, yet as that day was, so was God's strength.

4. What a varying promise it is! I do not mean that the promise varies, but adapts itself to all our changes. "As thy days, so shall thy strength be." Here is a fine sunshiny morning; all the world is laughing; everything looks glad; the birds are singing, the trees seem to be all alive with music. "My strength shall be as my day is," says the pilgrim. Ah! pilgrim, there is a little black cloud gathering. Soon it increases; the flash of lightning wounds the heaven, and it begins to bleed in showers. Pilgrim, "As thy days, so shall thy strength be." The birds have done singing, and the world has done laughing; but "as thy days, so shall thy strength be." Now the dark night comes on, and another day approaches — a day of tempest, and whirlwind, and storm. Dost thou tremble, pilgrim? — "As thy days, so shall thy strength be."

5. What a long promise this is! You may live till you are never so old, but this promise will outlive you. When thou comest into the depths of the river Jordan, "as thy days, so shall thy strength be"; thou shalt have confidence to face the last grim tyrant, and grace to smile even in the jaws of the grave. And when thou shalt rise again in the terrible morning of the resurrection, "as thy days so shall thy strength be"; though the earth be reeling with dismay thou shalt know no fear; though the heavens are tottering with confusion thou shalt know no trouble. "As thy days, so shall thy strength be." And when thou shalt see God face to face, though thy weakness were enough to make thee die, thou shalt have strength to bear the beatific vision: thou shalt see Him face to face, and thou shalt live; thou shalt lie in the bosom of thy God; immortalised and made full of strength, thou shalt be able to bear even the brightness of the Most High.

III. What INFERENCE shall I draw except this? Children of the living God, be rid of your doubts, be rid of your trouble and your fear. Young Christians, do not be afraid to set forward on the heavenly race. You bashful Christians, that, like Nicodemus, are ashamed to come out and make an open profession, don't be afraid: "As your day is, so shall your strength be."

( C. H. Spurgeon.)

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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.