Psalms 71:18 - Joseph Benson’s Commentary on the Old and New Testaments

Now also when I am old, &c., forsake me not Do not abandon the care of me when I need it most: but continue the same kindness to me in my declining years which I experienced when I was a youth. Those that have been taught of God from their youth, and have made it the business of their lives to honour him, may be sure he will not leave them when they are old and gray-headed, will not leave them helpless and comfortless, but will make the evil days of old age their best days, and such as they shall have reason to say they have pleasure in. Until I have showed thy strength By my own experience of its being exerted in fresh instances in my behalf; unto this generation To which I owe peculiar duties, and which I desire to serve according to thy will, Acts 13:36; and thy power to every one that is to come To all future generations, by leaving my observations upon it on record for their benefit. Thus, as David acknowledges that “it was the God of Israel who taught him, as a warrior, to conquer, and as a psalmist, to declare the wondrous works of his great benefactor; so he requests to be preserved in his old age, until, by completing his victories, and his Psalms composed to celebrate them, he had showed the strength and power of God,” not only to his cotemporaries, “but to all that should arise in after times, and chant those divine hymns in the assemblies of the faithful, throughout all ages.” In like manner, “if St. Paul wish to have his life continued on earth, it is only that he may edify the church and glorify God. Otherwise it is far better, says he, to depart and be with Christ.” Horne. In imitation of these, and such like excellent examples, as long as we live we ought to be endeavouring to glorify God, and edify one another; and those that have had the largest and longest experience of the goodness of God to them, should improve their experience for the good of their friends. And it is a debt which the old disciples of Christ owe to the succeeding generations, to leave behind them a solemn testimony to the power, and pleasure, and advantage of religion, and the truth of God's promises.