Adam Clarke on Psalms 17:5

Hold up my goings in thy paths - David walked in God's ways; but, without Divine assistance, he could not walk steadily, even in them. The words of God's lips had shown him the steps he was to take, and he implores the strength of God's grace to enable him to walk in those steps. He had been kept from the paths of the destroyer; but this was not sufficient; he must walk in God's paths - must spend his life in obedience to the Divine will. Negative holiness ean save no man. "Every tree that bringeth not forth good fruit is hewn down, and cast into the fire."