The story in learner-safe form
金石良言 uses durable materials to praise words that deserve to be kept. The phrase is less about eloquence and more about reliable value. Modern learners usually need the phrase as a decision tool. It tells them when a situation has crossed a specific boundary, not merely which English word looks similar. In the examples here, the phrase is tested against study advice, practical warning, meaning boundary so the reader can see how the meaning changes with use. The safest reading is to keep the image, the tone, and the social situation together. 金石良言 uses durable materials to praise words that deserve to be kept. The phrase is less about eloquence and more about reliable value. For English speakers, the useful memory is not only the literal image but the decision it makes possible. The examples test study advice, practical warning, meaning boundary so the phrase remains tied to real use instead of becoming a decorative translation label. For this entry, the origin note is only the beginning of the explanation. The useful question is why 金石良言 survived as a portable judgment rather than as a decorative allusion. The story image route gives the reader an image, but the modern sentence must still prove its own fit. A learner should ask three things: what concrete object is being judged, what evidence in the sentence supports that judgment, and what tone the phrase adds that a plain English adjective would not add. This is why the page tests 金石良言 through study advice, practical warning, meaning boundary, usage boundary, misuse boundary; each context changes the pressure on the phrase and shows whether the idiom is acting as praise, warning, neutral description, or criticism. The story or usage background also has a translation boundary. 金石良言 can point toward valuable advice, words worth remembering, sound and lasting counsel, but those English choices are not interchangeable. One version may preserve the image, another may sound natural in a classroom answer, and another may be safer in a workplace or essay sentence. The entry therefore treats public references as source cards, not as a paragraph order to imitate. Headword checks, story labels, and English equivalents are separated first; only after that are they rebuilt into the learner path used here: answer, label, examples, wrong-use clinic, comparison, story, and practice. The most common failure is overextension. Because 金石良言 has a memorable surface, learners may reach for it whenever a topic feels close. The better habit is to compare it with 良药苦口 and 一针见血 and with 口蜜腹剑 and 口是心非 before writing. If the rejected phrase is hard to reject, the sentence probably has not supplied enough evidence. If the rejected phrase is easy to reject, the learner can explain the boundary and use 金石良言 with confidence. That is the practical purpose of the origin section: it turns cultural memory into a sentence-level decision instead of leaving the reader with a story and no next action. This retelling is intentionally not a long quotation. It gives the visible action, the mistake or insight, and the modern use boundary so a reader can remember the story without treating every later sentence as a historical claim.