抬头不见低头见 If we do not meet when we look up, we meet when we look down. Said of people who see each other all the time.
冤家宜解不宜结 An enmity should be untied, not tied tighter.
不打不相识 No fight, no friendship. In chapter 38 of the Water Margin, Dai Zong tells two men: “Now you two can be close brothers. As the saying goes, without a fight there is no friendship (不打不成相识).”
和气生财 Friendliness brings wealth. A merchants’ saying: those who are pleasant and give no offense to customers will prosper.
化干戈为玉帛 Turn shields and spears into jade and silk. To turn war or a quarrel into peace and friendship.