水清则无鱼人贱则无敌
[shuĭ qīng zé wú yú rén jiàn zé wú dí]
The idiom 'clear water cannot retain fish', often suggests that over-idealized or overly-perfect situations do not work well. When paired with the next part it humorously means that when you keep your personality humble or easygoing, there’s nothing you can’t handle in social or life circumstances.