Jeremiah 1:17-18

Now, gird up your loins and arise, and speak to them all which I command you. Do not be dismayed before them, or I will dismay you before them. Now behold, I have made you today as a fortified city and as a pillar of iron and as walls of bronze against the whole land, to the kings of Judah, to its princes, to its priests and to the people of the land.