Is vengeance the inverse of forgiveness?

This week's lesson "Rest, Relationships, and Healing" is focussed on forgiveness, and remarkably that keyword doesn't occur in the book of Proverbs. It has more to say about vengeance and judgement - but that turns out to offer insight about why we forgive. We look in particular at Proverbs 20:22, and then discover somewhat of a theme in this chapter.