Jesus said that people will call us sons of God when we are peacemakers. Why? Because it is so rare for people to consistently try to be a peacemaker, with humility, tenderness, and wisdom. Again, whether it is making peace in their own conflicts, or being an arbitrator for two other parties, it is so contrary to human nature to do this consistently. Thus when people see us do it consistently—not occasionally but consistently—Jesus said they will conclude we are like our heavenly Father. They see that we are being motivated by the God of heaven. Nobody puts time, energy, and value into walking in love because it takes a lot of time and energy to do this. He calls us to be peacemakers.