[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 grayheaded, O God, forsake me not; until I have shewed thy strength unto this generation, and thy power to every one that is to come. [19] Thy righteousness also, O God, is very high, who hast done great things: O God,