What does Psalm 115:5-8 mean?

5 They have mouths, but they speak not: eyes have they, but they see not: 6 They have ears, but they hear not: noses have they, but they smell not: 7 They have hands, but they handle not: feet have they, but they walk not: neither speak they through their throat. 8 They that make them are like unto them; so is every one that trusteth in them. (Psalm 115:5-8 KJV)

Patrick/Lowth/Whitby/Lowman Commentary

They are mere lifeless images; that have mouths, but cannot give a word of advice, or of encouragement and comfort, to their supplicants: and eyes also, but cannot see the devotion wherewith they look up unto them, or prostrate themselves before them.

Let their worshippers cry to them never so loudly, they cannot hear a word: all the frankincense and sweet odors which they burn to them are merely lost; for they cannot smell them.

Though they have thunderbolts in their hands they feel them not; nor are able to do either good or harm: they cannot stir a foot from the place where they stand, unless they be carried; nor make so much noise as a fly; being utterly void of breath, as well as of sense and reason.

To what then, but to those idols, shall we compare the makers of them, and such as confide in them? Who are mere images of men: having eyes, but do not see that the brutes are more excellent than such gods: and that the least help is not to be expected from them.