" Human social life is built on this ability to “reflect” each other and respond to those reflections, with both positive and negative results. For example, if you are feeling great and go to work where your supervisor is in a vile mood, soon you will probably feel lousy, too. If a teacher becomes angry or frustrated, the children in her classroom may begin to misbehave, reflecting the powerful emotion being expressed by the teacher. To calm a frightened child, you must first calm yourself. "

― Bruce D. Perry , The Boy Who Was Raised as a Dog: And Other Stories from a Child Psychiatrist's Notebook