Lesson 9 What Is Sin? When we use our free will to choose evil, we sin. Catechism Connections Lesson Topics Reconciliation Essential Lessons Lesson Vocabulary Sin: is something that we say, do, think, or fail to do that does not love God, our neighbor, or ourselves. Teach The Pieta jpeg The Pietà (1498-1499)jpeg Extend Session 9 Absent Student Handout pptx Session 9 Parent Newsletter pdf