7. Here are some examples. Certain objects make sounds. Take a flute or a harp. No one will know what the tune is unless different notes are played.
8. Also, if the trumpet call isn't clear, who will get ready for battle?
9. It's the same with you. You must speak words that people understand. If you don't, no one will know what you are saying. You will just be speaking into the air.
10. It is true that there are all kinds of languages in the world. And they all have meaning.