悪わるいことは言いわない

expression

I'm telling you this for your own good; here's some friendly advice

A set phrase used when giving advice or a warning that the speaker believes is in the listener's best interest, often with a slightly paternalistic tone.

• 悪わるいことは言いわないから、その話はなしはやめておきなさい。

  I'm telling you this for your own good: you'd better drop that matter.

• 悪わるいことは言いわない。もっと勉べん強きょうしたほうがいいよ。

  Take my friendly advice: you should study more.