We can resolve differences through words instead of war. Language can arguable be considered the center of everyday life for humans. Just imagine what the human race would be like living without language. In many situations, language can help create and communicate understanding. People can resolve differences through words instead of war.
Words convey ideas, many of which can only be communicated through language.
Through language people can give advice. Others, through language, can share their perspective on a situation, which in hindsight may make that situation clearer to another person. Words can, and many times do, reveal truth. People's minds become so biased from the lies that they are told that many times only the testimony of a witness can convince them of the real truth. People use words to justify and clarify exactly what they are trying to say, to be clear and concise.