keep your friends close and your enemies closer
與朋友保持親近，與敵人保持更親近
口語·策略性人際建議
英文釋義
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.
典故來源
出自《教父》第二部，但思想可追溯至中國古代兵法，如孫子強調知己知彼。