Language is powerful, because it helps connect with others. It makes a better relationship, or make a worse relationship. By connecting with others, it’s possible to express your feelings and what you’re feeling, and what others can’t understand without language.
Also language could make, prevent, violence, and peace. You could convince them you are right and have the same idea, or there might be peace when you are convinced. But words could also make disagreements lead up to violence or hate. If there was no language there is no way of disagreeing so it is not possible, but there is language, I think that language is most powerful because there is language.