"Who can measure the results of those years of toil and wandering among the lonely hills? The communion with nature and with God, the care of his flocks, the perils and deliverances, the griefs and joys, of his lowly lot, were not only to mold the character of David and to influence his future life, but through the psalms of Israel's sweet singer they were in all coming ages to kindle love and faith in the hearts of God's people, bringing them nearer to the ever-loving heart of Him in whom all His creatures live. PP 642.1"
"The Lord is my shepherd; I shall not want."
The EGW passage discusses David's experiences as a shepherd and how they shaped him and his psalms, which in turn inspire faith. Psalm 23:1, a famous shepherd psalm attributed to David, directly reflects this theme. The connection is valid and meaningful.
David, in the beauty and vigor of his young manhood, was preparing to take a high position with the noblest of the earth. His talents, as precious gifts from God, were employed to extol the glory of the divine Giver. His opportunities of contemplation and meditation served to enrich him with that wisdom and piety that made him beloved of God and angels. As he contemplated the perfections of his Creator, clearer conceptions of God opened before his soul. Obscure themes were illuminated, difficulties were made plain, perplexities were harmonized, and each ray of new light called forth fresh bursts of rapture, and sweeter anthems of devotion, to the glory of God and the Redeemer. The love that moved him, the sorrows that beset him, the triumphs that attended him, were all themes for his active thought; and as he beheld the love of God in all the providences of his life, his heart throbbed with more fervent adoration and gratitude, his voice rang out in a richer melody, his harp was swept …
"When I consider thy heavens, the work of thy fingers, the moon and the stars, which thou hast ordained; What is man, that thou art mindful of him? and the son of man, that thou visitest him?"
The EGW passage describes David contemplating God's creation and being inspired to write psalms. Psalm 8:3-4 expresses a similar sentiment of awe and wonder at God's creation, prompting reflection on humanity's place in the universe. The connection is a valid thematic parallel.