It's always fun to read Hebrew Poetry because it always contains richness which cannot be captured in English. I love the word plays in this passage. The point is your idols do not speak; they cannot teach you anything, instead they are shaped as demonstrations of a lie. Keep silent (do not speak to your idols) before the God who speaks.
“What profit is a shaped idol when its formulator has shaped it, a metal image, a demonstration (word play teacher) of a lie? For its formulator trusts in his own formation when he makes speechless idols! Woe to him who says to a wooden thing, Awake; to a silent stone, Arise! Can this demonstrate (teach)? Behold, it is overlaid with gold and silver, and there is no breath at all in it. But the LORD is in his holy temple; let all the earth keep silence before him.”