Psalm 115 is one of the most anti-idolatry polemics in the Old Testament, ranking alongside Isaiah 44 and Jeremiah 10. A taste:
Their idols are merely things of silver and gold,
shaped by human hands.
They have mouths but cannot speak,
and eyes but cannot see.
They have ears but cannot hear,
and noses but cannot smell.
They have hands but cannot feel,
and feet but cannot walk,
and throats but cannot make a sound.
And then, after these lines, the passage I shared above: "And those who make idols are just like them, as are all who trust in them."
You've heard the refrain, "You become what you worship." That's the claim of Psalm 115. You are transformed into the image of your idols. You are conformed to what you trust. You are poured into the mold of what you worship.
This point is relevant to the current series concerning the relationship of the moral and symbolic to the ontological. A point I've made in that series concerns moral and symbolic drift. If we're not in contact with something steady, enduring, particular, and real we're prone to curating and adopting a moral and symbolic worldview that becomes self-referential and self-reinforcing. As I describe in The Shape of Joy, the self begins to loop. That's the vision of Psalm 115, how idols becomes egoistic mirrors, narcissistic reflections, and self-referential loops. We come to worship ourselves.
