Scott Alexander, in Meditations on Moloch, almost in passing:

I remembered the rationalist proverb that if you don’t understand something, you need to call it by a term that reminds you that you don’t understand it or else you’ll think you’ve explained it when you’ve just named it.

This isn’t really rationalist, it’s everywhere. It’s the naming problem, and it’s all over the sciences of mind. Clark Hull worried about it in 1943; the homuncular problem is the same mistake with a little man in it.