[xīn rú jīn shí]   

心    如    金    石    犹心如铁石。比喻心肠硬或意志十分坚决。

心如金石，成语，释义为犹心如铁石。比喻心肠硬或意志十分坚决。出自《后汉书·王常传》。

Keep one's heart as hard as the nether millstone

心手相应    心辣手狠    心殒胆破    心忙意乱    心满意足