搞阴谋诡计的人注定要失败。

Those who go in for intrigues and conspiracy are doomed to failure.

《新英汉大辞典》

搞阴谋诡计的人，必然要落得可耻的下场。

Plotters come to no good end.

《新英汉大辞典》

依我的经验，多数情况下并不存在什么阴谋诡计。

In my experience, in most cases there is no hidden agenda.

youdao

But they surely must have done it before too.

但是之前也肯定有过阴谋诡计

耶鲁公开课 - 古希腊历史简介课程节选