O God, thou hast taught me from my youth - See Psalm 71:5-6. That is, God had guided and instructed him from his earliest years. He had made known to him his own being and perfections; he had made his duty plain; he had led him along the dangerous path of life.

And hitherto have I declared - I have made known. That is, he had done this by public praise; he had done it by his writings; he had done it by maintaining and defending the truth. In all situations of life, up to that time, he had been willing to stand up for God and his cause.

Thy wondrous works - See Psalm 9:1, note; Psalm 26:7, note. Doings or acts which were suited to attract attention; to awe the mind by their greatness; to inspire confidence by their wisdom.

Thou hast taught me from my youth - I have had thee for my continual instructor: and thou didst begin to teach me thy fear and love from my tenderest infancy. Those are well taught whom God instructs; and when he teaches, there is no delay in learning.

O God, thou hast taught me from my youth,.... The corruption of human nature; the weakness and impotence of it, to everything that is spiritually good; and the need of continual strength and grace from Christ, to go to him for righteousness and strength, life and salvation, and to walk by faith on him; the doctrine of justification by the righteousness of Christ, and the insufficiency of his own; the will, ways, and worship of God; and all the duties of religion, prayer, praise, &c. and whoever were the instruments, or whatever were the means, of teaching David these things, he ascribes it to God. Whether his parents, or the priests and Levites, taught him the sacrifices and ordinances of the law, it was the Lord that blessed instructions to him; and that taught him by providences and precepts, and by his Holy Spirit. And a wonderful blessing it is to be taught of God, and not of men, things relating both to doctrine and practice; and it is an addition to it to be taught these things early, as David was from his youth; and therefore the Lord was so soon the object of his faith and trust, Psalm 71:5; and, as Timothy, from a child, was acquainted with the holy Scriptures, and the things contained in them, which are able to make wise unto salvation, Isaiah 29:13;

and hitherto have I declared thy wondrous works: not only of nature and providence, but of grace; the treasuring up of all grace, and the blessings of it in Christ; the work of redemption by him; the work of regeneration and conversion by his Spirit; and the perseverance of the saints by his grace and strength; which are all wonderful and amazing. And as the psalmist saw his interest in these things, and had an experience of them, he declared them to others for their encouragement, and to the glory of all the three Persons; see Psalm 66:16.

17 O God, thou hast taught me from my youth: and hitherto have I declared thy wondrous works.

18 Now also when I am old and greyheaded, O God, forsake me not; until I have shewed thy strength unto this generation, and thy power to every One that is to come.

Psalm 71:17

"O God, thou hast taught me from my youth." It was comfortable to the Psalmist to remember that from his earliest days he had been the Lord's disciple. None are too young to be taught of God, and they make the most proficient scholars who begin betimes. "And hitherto have I declared thy wondrous works." He had leaned to tell what he knew, he was a pupil teacher; he continued still learning and declaring, and did not renounce his first master; this, also, was his comfort, but it is one which those who have been seduced from the school of the gospel, into the various colleges of philosophy and scepticism, will not be able to enjoy. A sacred conservatism is much needed in these days, when men are giving up old lights for new. We mean both to learn and to teach the wonders of redeeming love, till we can discover something nobler or more soul-satisfying; for this reason we hope that our greyheads will be found in the same road as we have trodden, even from our beardless youth.

Psalm 71:18

"Now also when I am old and greyheaded, O God, forsake me not." There is something touching in the sight of hair whitened with the snows of many a winter: the old and faithful soldier receives consideration from his king, the venerable servant is beloved by his master. When our infirmities multiply, we may, with confidence, expect enlarged privileges in the world of grace, to make up for our narrowing range in the field of nature. Nothing shall make God forsake those who have not forsaken him. Our fear is lest he should do so; but his promise kisses that fear into silence. "Until I have shewed thy strength unto this generation." He desired to continue his testimony and complete it; he had respect to the young men and little children about him, and knowing the vast importance of training them in the fear of God, he longed to make them all acquainted with the power of God to support his people, that they also might be led to walk by faith. He had leaned on the almighty arm, and could speak experimentally of its all-Sufficiency, and longed to do so ere life came to a close. "And thy power to every one that is to come." He would leave a record for unborn ages to read. He thought the Lord's power to be so worthy of praise, that he would make the ages ring With it till time should be no more. For this cause believers live, and they should take care to labour zealously for the accomplishment of this their most proper and necessary work. Blessed are they who begin in youth to proclaim the name of the Lord, and cease not until their last hour brings their last word for their divine Master.

O God, thou hast taught me from my youth: and hitherto have I declared thy wondrous works.

17-21. Past experience again encourages.

taught me, &c.-by providential dealings.

71:14-24 The psalmist declares that the righteousness of Christ, and the great salvation obtained thereby, shall be the chosen subject of his discourse. Not on a sabbath only, but on every day of the week, of the year, of his life. Not merely at stated returns of solemn devotion, but on every occasion, all the day long. Why will he always dwell on this? Because he knew not the numbers thereof. It is impossible to measure the value or the fulness of these blessings. The righteousness is unspeakable, the salvation everlasting. God will not cast off his grey-headed servants when no longer capable of labouring as they have done. The Lord often strengthens his people in their souls, when nature is sinking into decay. And it is a debt which the old disciples of Christ owe to succeeding generations, to leave behind them a solemn testimony to the advantage of religion, and the truth of God's promises; and especially to the everlasting righteousness of the Redeemer. Assured of deliverance and victory, let us spend our days, while waiting the approach of death, in praising the Holy One of Israel with all our powers. And while speaking of his righteousness, and singing his praises, we shall rise above fears and infirmities, and have earnests of the joys of heaven. The work of redemption ought, above all God's works, to be spoken of by us in our praises. The Lamb that was slain, and has redeemed us to God, is worthy of all blessing and praise.