Then shall I not be ashamed - On the word ashamed, see Job 6:20, note; Psalms 25:2-3, note. The meaning here is, that he would not have occasion to be ashamed; he would not be disappointed; all his hopes would be realized. He would have full evidence of piety; he would enjoy the comforts which he sought in religion; he would feel assured of ultimately obtaining eternal life.
When I have respect unto all thy commandments - literally, “In my looking at all thy commandments.” That is, in his regarding them; in his feeling that all were equally binding on him; and in his having the consciousness that he had not intentionally neglected, violated, or disregarded any of them. There can be no true piety except where a man intends to keep all the commands of God. If he makes a selection among them, keeping this one or that one, as may be most convenient for him, or as may be most for his interest, or as may be most popular, it is full proof that he knows nothing of the nature of true religion. A child has no proper respect for a parent if he obeys him only as shall suit his whim or his convenience; and no man can be a pious man who does not purpose, in all honesty, to keep All the commandments of God; to submit to his will in everything.