What does Jeremiah 17:21 mean?

Let them be disappointed who persecute me, but let not me be disappointed. Let them be dismayed, but don’t let me be dismayed. Bring on them the day of evil, and destroy them with double destruction.

Yahweh said this to me: “Go, and stand in the gate of the children of the people, through which the kings of Judah come in and by which they go out, and in all the gates of Jerusalem.

Tell them, ‘Hear Yahweh’s word, you kings of Judah, and all Judah, and all the inhabitants of Jerusalem, that enter in by these gates:

Don’t carry a burden out of your houses on the Sabbath day. Don’t do any work, but make the Sabbath day holy, as I commanded your fathers.

But they didn’t listen. They didn’t turn their ear, but made their neck stiff, that they might not hear, and might not receive instruction.

It will happen, if you diligently listen to me,” says Yahweh, “to bring in no burden through the gates of this city on the Sabbath day, but to make the Sabbath day holy, to do no work therein;