expression
some things are better left unsaid; silence is golden
Proverb meaning that not saying something can be more graceful or wise than speaking out; often used to advise restraint in expressing opinions or complaints.
あの場で反論しなかったのは、言わぬが花だったと思う。
I think not arguing back at that moment was a case of 'silence is golden'.
言わぬが花というから、余計なことは言わないほうがいい。
They say some things are better left unsaid, so you'd better not say anything unnecessary.