心如金石

Explanation: Utah heart like a stone. Analogy is very strong-hearted hard or will. 　　Source: "King of the Later Han Chang Chuan" The family wing of the Han Dynasty rate xiajiang Zhu Jiang, a heart like stone, really loyal too. " 　　Examples: At stake, not to know much ~ located, how Yields? ★ "Five Dynasties History of Jin, then roll down"