Matthew 12:33–37: Words Reveal the Heart
Jesus treats bad language as fruit, not foliage: words grow out of whatever fills the heart. That means cleaned-up speech without a changed heart misses the point of Matthew 12:33–37.
Matthew 12:43–45: Demons Returning Stronger
Jesus describes a spirit that leaves a person, wanders, and returns with seven worse spirits to a house that is empty, swept, and put in order. The warning is not about a method of deliverance but about a life cleared of evil and left unoccupied.
Can a Christian Commit the Unpardonable Sin?
Jesus places one sin outside the wide reach of forgiveness: attributing the Spirit's evident work to evil. That warning is a call to turn to Christ, not a tool for diagnosing a hidden soul.