"Kind words do not cost much. Yet they accomplish much."
In an era of short attention spans, it can be difficult to retain interest during a conversation, lecture or presentation. Frequently, the talker and the listener have to share common interest to have both parties engaged. Even when common interest is shared, a conversation can be too stimulating or too trivial and cause a person to loose interest.
In order to effectively engage and keep a conversation stimulating, communication should be balanced between passion and grace. Between medicine balls and beach balls.
If you only throw a medicine ball to someone, they will eventually become exhausted. If you only throw a beach ball, the novelty will fade and the person will not be challenged.
Similar to playing catch with different sizes of balls, communication should be balanced between medicine balls and beach balls. The balance will help stimulate and lightly engage a communicator and listener. ...And make sure the words "accomplish much."