Psalms 71:17

“O God, thou hast taught me from my youth, etc.] 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, etc. 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…”

“O God, thou hast taught me from my youth - See Psalms 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 Psalms 9:1, note; Psalms 26:7, note. Doings or acts which were suited to attract attention; to awe the mind by their greatness; to…”

“thou hast: Psa 71:5, Psa 119:9, Psa 119:102 hitherto: Psa 66:16; Sa1 17:36, Sa1 17:37; Sa2 4:9, 22:1-51; 1Chr. 16:4-36 Psalms 71:18”