a proverb meaning 'some things are better left unsaid' or 'silence is golden' — sometimes it's best not to speak.
彼の失敗についてあれこれ言わない方がいい。言わぬが花だ。
It's better not to go on about his mistake. Some things are better left unsaid.
全部正直に言うべきか迷ったが、言わぬが花だと思って黙っていることにした。
I hesitated whether to tell everything honestly, but thought it's best to stay silent.