en_tn_condensed/jer/01/18.md

Behold!

"Pay attention!"

Today I have made you a fortified city, an iron pillar, and bronze walls against the whole land

Being strong like these things represents being confident and unchanging in saying what God had told him to say. Alternate translation: "I have made you strong against the whole land like a fortified city, an iron pillar, and bronze walls" (See: rc://en/ta/man/jit/figs-metaphor)

iron ... bronze

These were the strongest materials known at that time. (See: rc://en/ta/man/jit/figs-metaphor)

the whole land

This represents all the people of the land. (See: rc://en/ta/man/jit/figs-metonymy)