Jeremiah 1:17-18

But you [Jeremiah], gird up your loins [in preparation]! Get up and tell them all which I command you. Do not be distraught and break down at the sight of their [hostile] faces, or I will bewilder you before them and allow you to be overcome. Now behold, I have made you today like a fortified city and like an iron pillar and like bronze walls against the whole land—against the [successive] kings of Judah, against its leaders, against its priests, and against the people of the land [giving you divine strength which no hostile power can overcome]. [Is 50:7; 54:17; Jer 6:27; 15:20; Luke 21:15; Acts 6:10]