Here the word "tongues" represents what people say. Alternate translation: "We will prevail because of what we say" (See: [[rc://en/ta/man/translate/figs-metonymy]])
This rhetorical question is asked to emphasize that they believed no one could rule over them. It can be translated as a statement. Alternate translation: "no one can rule over us!" (See: [[rc://en/ta/man/translate/figs-rquestion]])