你最好心平气和地同他讲理。

You'd better reason thing out with him calmly.

跟夏洛克讲理是没有用的。

It is useless trying to argue with Shylock.

跟他讲理只会使他更加生气。

Trying to reason with him only enrages him even more.

这个歇后语比喻对蛮横不讲道理的人，是无法和他讲理的。

This saying implies that there is no reasoning with an unreasonable person.