These phrases express very similar ideas. (See: [[rc://en/ta/man/translate/figs-parallelism]])
# You will break them with an iron rod
Defeating the nations is spoken of as breaking them, and his power is spoken of as an iron rod. AT: "You will defeat them completely by your power" (See: [[rc://en/ta/man/translate/figs-metaphor]])
# you will smash them to pieces
Destroying nations is spoken of as if they could be smashed like a clay jar. AT: you will completely destroy them like a clay pot" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-simile]])
# a jar of a potter
A potter is a person who makes clay pots and jars. These are fragile and can be broken easily. AT: "a clay jar" or "a clay pot" (See: [[rc://en/ta/man/translate/translate-unknown]])