"Speak the truth in love," and "see that none of you repays evil for evil," exhorts St. Paul. Which is easier said than done.
Matthew invites us into a whole variety of experiences this Sunday. Verses 10 through 20, considered optional, center around a conflict about tradition and authority followed by a parable about the truth of the actions of the heart. This is followed by healings and feedings. The next chapter begins with more conflict.
Change sets off a burst of emotional energy. In working with congregations, I'm occasionally surprised by the vehemence or the source of the emotionality, but never by its presence.