Charles H. Spurgeon on Psalms 103:5

Thy youth is renewed like the eagle's. However bold it may sound, we say not too much when we speak of an eternal youth, as the glorious privilege of the devout servant of the Lord, but of him alone. All that with reason charms and captivates in the appearance of youth, is seen in heightened measure where the spiritual life develops itself undisturbed in fellowship with God. Does the innocence of youth attract you? In the natural life it is but too frequently a misleading appearance; but in the life of the soul it returns to a certain extent when the heart is purified through the power of the Holy Ghost, and the life is renewed in conformity with that of Christ the Lord. Does the enjoyment of youth surpass in your estimation that of any other here below? Be it so; yet all too speedily it is driven away by the cares of later years, whilst enjoyment free from care even in the dark days may dwell in the heart whereon has descended the peace of God through faith. The strength of youth, seems it to you desirable? Ah! day by day stamps truth upon the words: "Youth shall faint and be weary; "but even when the natural strength has already long attained its zenith, the Christian often feels himself elevated through a power from on high, which lifts him above physical weakness; and what no strength of sinew or muscle could accomplish is attained through the power of implicit faith. Yea, even the beautiful developement which the period of youth shows you, ye would not seek in vain in that man who, leaning on God's hand, forgetting the things that are behind, stretches forward from light to light, from strength to strength, from bliss to bliss. How, finally, can hope, that makes the youthful heart beat high with throbs of joy, be lacking to him? The fairest part of life the sensual man sees soon behind him, the spiritual man always in prospect; and like the eagle, this last can often from the low atmosphere round him soar to the pure, clear ether, whence already from afar the image, nay, the ineffable reality, shows him a more than earthly joy.

Eternal youth: it may, yet much more than for David, now be the portion of every Christian, but for these alone. Without faith and hope in the heart, even the bravest determination to remain young always, or at least as long as possible, must give away before the first great storm of life. Yet even when faith and hope are not strangers to us, whence is it that in our spiritual life there is frequently so little of the "eagle" spoken of here, and so much of the "sparrow alone upon the housetop, "referred to in Ps 102:7 Can it be that we allow ourselves too little to be satisfied with the good things of which David had spoken immediately before; that is to say, that we live so little on the best things which God has to bestow, —his word, his Spirit, his grace? Only through these do we attain that lasting second birth, of which the eagle is the emblem, and an unfading youth of heart the inestimable fruit. Ye who are young in years, seek this undying youth above all the joys of early life! Recover it, ye middle-aged, in living fellowship with him who maketh all things new within! Preserve it, old friends of God and of his Christ, as your fairest crown here on earth, and the earnest of your bliss in heaven. And thou, Christian, who sittest down disconsolate, bethink thyself; the eagle lets his wings hang down, only thereafter to soar with stronger flight! J.J. Van Oosterzee, in "The Year of Salvation," 1874.