Through not only words, but through tone of voice and through gesture, posture, facial expression, etc., we constantly communicate to those around us. Through these channels, we constantly receive communication from others. Even when you sleep, you communicate. Interpersonal communication is irreversible You can't really take back something once it has been said. The effect must inevitably remain.
Interpersonal communication is complicated No form of communication is simple.
Because of the number of variables involved, even simple requests are extremely complex. We don't actually swap ideas, we swap symbols that stand for ideas. This also complicates communication. If a message can be understood in different ways, it will be understood in just that way which does the most harm. There is always somebody who knows better than you what you meant by your message.