Love mercy
The Bible gives you direction for removing a heretic from your midst after you have exhausted the process of correcting him. This is an extreme step. It also gives direction for redemption and restoration. You are to forgive those who repent and restore those who oppose themselves in a spirit of meekness. You are to seek and save the lost sheep and rejoice when they are returned to the fold. Which approach do you prefer to take? Your heart will lead you one way or the other. My word addresses both subjects, but it places much more emphasis on redemption. I had to correct my own disciples who wanted to call down fire from heaven on their enemies. Do justice out of necessity, but love mercy and you will be an agent of mercy.