9. (Isa 40:18, 20; 41:29).
      delectable things--the idols in which they take such pride and delight.
      not profit-- (Hab 2:18).
      they are their own witnesses--contrasted with, "Ye are My witnesses" (Isa 44:8). "They," that is, both the makers and the idols, are witnesses against themselves, for the idols palpably see and know nothing (Ps 115:4-8).
      that they may be ashamed--the consequence deducible from the whole previous argument, not merely from the words immediately preceding, as in Isa 28:13; 36:12. I say all this to show that they are doomed to perish with shame, which is their only fitting end.

JFB.