“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. They will fight against you, but they will not overcome you, for I am with you to deliver you," declares the LORD.”
Jeremiah 1:17-19 NASB
"Gird up your loins." Get ready for battle. Go through the ritual of preparing your clothes and everything else about yourself to be the strongest that you can. Don't think about your weakness. Don't focus on the things you can't do. If you focus on such things, you will defeat yourself before you even approach your enemies. Don't expect Me to save you out of a situation like that if you don't even take full advantage of the strength that I have put within you to compensate for your weaknesses.
Yes, you do have weaknesses. I don't expect you to lie about that. But you also have My strength and My help and My presence that will be with you in all situations. If you ignore my presence and the reassurance of my help and my faithfulness when you go to be in the presence of your enemies, then you have already given up the battle. To think only about your weaknesses and not about My strength is to break down. And if you allow yourself to break down by focusing on that weakness, then I will let you be broken down in front of these people.
You can be strong in attitude in the face of your enemies because you have real strength from Me. I have given you strong walls. I have strengthened you with strength that no one can overcome. I am with you, and I will deliver you. Start with this strength, My strength, in mind. Then you will not break down. Remember My strength from the very beginning, and you will not be defeated.