An excess of courtesy is discourtesy.

过分的礼貌是不礼貌的。

相关名言

It is better to have too much courtesy than too little, provided you are not equally courteous to all, for that would be injustice.

礼貌太多总比太少好,只要你对所有人都没有同样的礼貌,因为那是不公平的。

Courtesy on one side only never lasts for long.

单方面的礼貌永远不会持久。