keep your friends close and your enemies closer
与朋友保持亲近，与敌人保持更亲近
口语·策略性人际建议
英文释义
Be vigilant and maintain a close watch on people who may pose a threat to you, as they may be harder to defeat if you underestimate them.
例句
I don't trust my rival, but I keep your friends close and your enemies closer to watch his moves.
典故来源
出自《教父》第二部，但思想可追溯至中国古代兵法，如孙子强调知己知彼。