Let sleeping dogs lie – do not make trouble if you don’t have to.
(打扰一只睡梦中的狗狗后果一样很严重)不要自找麻烦
e.g. There’s absolutely no point pursuing this issue. We should just let sleeping dogs lie.
例句:在这个问题上深究没有意义,我们不要自找麻烦了。