出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第262页（227字）
忠实正直的话，听起来不顺耳，例良药苦口利于病，忠言逆耳利于行。
It is said that good medicine is bitter to the mouth，but it will cure disease；honest advice is unpleasant to the ear，but it induces good conduct．