The people should not be afraid even if they notice that the nations are stronger than they are. AT: "Even if you say in your heart" (See: [[rc://en/ta/man/translate/figs-idiom]])
Moses uses a question to emphasize that the people may feel afraid of the other nations. This question can be translated as a statement. AT: "I cannot defeat them" (See: [[rc://en/ta/man/translate/figs-rquestion]])