suitable words

Purpose of communication is for the listener to understand the speaker. Thus, the language and words used should be selected with reference to the listener. However, I notice there are people whose purpose of communication is to express themselves. In this case, the media/language/words used were suitable to the speaker, and usually listeners do not understand.

When I am a listener in such situation, I won't be too anxious to know what's the message, because that's not the purpose of the speaker to speak in the first place.