When you talk, you are only repeating what you already know...

When you talk, you are only repeating what you already know. But if you listen, you may learn something new - Dalaï Lama

Greeting is an act of communication in which human beings intentionally make their presence known to each other, to show attention to, and to suggest a type of relationship (usually cordial) or social status (formal or informal) between individuals or groups of people coming in contact with each other.