"All are given an opportunity to develop character. All may fill their appointed places in God's great plan. The Lord accepted Samuel from his very childhood, because his heart was pure. He was given to God, a consecrated offering, and the Lord made him a channel of light. If the youth of today will consecrate themselves as did Samuel, the Lord will accept them and use them in His work. Of their life they may be able to say with the psalmist, “O God, Thou hast taught me from my youth: and hitherto have I declared Thy wondrous works.” [ Psalm 71:17 .] GW 69.2"
"O God, thou hast taught me from my youth: and hitherto have I declared thy wondrous works."
Ellen White directly references Psalms 71:17 in this passage.