John Gill

When I kept silence,.... Was unthoughtful of sin, unconcerned about it, and made no acknowledgment and confession of it to God, being quite senseless and stupid; the Targum adds, "from the words of the law"; which seems to point at sin as the cause of what follows; my bones waxed old; through my roaring all the day long; not under a sense of sin, but under some severe affliction, and through impatience in it; not considering that sin lay at the bottom, and was the occasion of it; and such was the violence of the disorder, and his uneasiness under it, that his strength was dried up by it, and his bones stuck out as they do in aged persons, whose flesh is wasted away from them; see Psa 102:3.