Connecting Statement:

Yahweh continues to speak to Babylon about her downfall as if she were a queen who is humiliated. (See: rc://en/ta/man/jit/figs-metaphor and rc://en/ta/man/jit/figs-personification)

you say in your heart

Here the word "heart" refers to the inner person. Alternate translation: "you say to yourself" (See: rc://en/ta/man/jit/figs-metonymy)