He asked each one of them to tell him what he had learned in Cheder that morning. His confidence was strengthened because he knew that as long as Jewish children attend yeshiva, study Torah, and observe the Mitzvos, G-d would never forsake His people. 114 Do not fear sudden terror, nor the destruction of the wicked when it comes. This verse tells us one should not be afraid of fear, for fear is paralyzing and harmful in itself. Even when the wicked are there and planning to destroy the world, we should not be afraid.
Sudden terror comes before worry, or fear of loss.
Even if they come fighting you, don't fear them, for G-d is on your side. The Tanya 116 expounds on depression, and says laziness arises from depression. If one is depressed and feels he will fail, then his depressions will cause him loss. But, if one is strong and firm, for he knows G-d is backing him, than he will win. Torah study and prayer are the prescribed medicine for this G-dly strength.