‘He shan zhi shi’ (literally ‘stones from another mountain’) is a classical Chinese idiom originating from the Book of Songs. It metaphorically refers to advice, criticism, or insights offered by people outside one’s immediate circle—especially those with fresh perspectives or different experiences. Though the characters literally denote physical stones, the phrase functions entirely figuratively: just as stones from a distant mountain can be used to polish jade, outsiders’ observations can help us improve ourselves.

This idiom is commonly used in reflective, advisory, or self-improvement contexts—such as mentorship, performance reviews, or personal growth discussions. It carries a respectful, humble connotation, implying openness to constructive feedback. The phrase is formal but widely understood in modern written and spoken Chinese, especially in education, management, and public discourse.