The power of Jeremiah comes from Yahweh (Jer 1:17-1:19)

“‘You!

Gird up your loins!

Stand up!

Tell them everything

That I command you!

Do not break down before them!

Or I will break you before them!

I for my part

Have made you today

A fortified city,

An iron pillar,

A bronze wall,

Against the whole land.

You will be against

The kings of Judah,

Its princes,

Its priests,

The people of the land.        

They will fight against you.

But they shall not prevail against you.

I am with you

To deliver you.’

Says Yahweh.”

Jeremiah will have the power of Yahweh behind him. Yahweh tells Jeremiah that he must get ready for a battle against others by standing up for Yahweh. He was to tell them everything that Yahweh had commanded him to say. He was not to break down or Yahweh would break him. He was going to be as strong as a fortified city, an iron pillar, or a bronze wall. However, Jeremiah was going to go against the whole land, including the kings, princes, priests, and all the people of Judah. They were going to fight against him, but they would not prevail, because Yahweh was with Jeremiah. Yahweh would save and deliver Jeremiah.