Jeremiah 1:17-18

Thou therefore gird up thy loins, and arise, and speak to them all that I command thee. Be not afraid at their presence: for I will make thee not to fear their countenance.

For behold I have made thee this day a fortified city, and a pillar of iron, and a wall of brass, over all the land, to the kings of Juda, to the princes thereof, and to the priests, and to the people of the land.