The meaning of "extreme sorrow turns to joy [1]", the meaning of "sincerity splits open gold and stone", the meaning of "hard work pays off for the resolute man", Wanyan Xu thoroughly understood the meaning of all such expressions in a split second. He was almost bursting with joy, and instinctively felt that he should cover his face with smiles and squeeze out two tears to express how moved he was. But all he did was to stare blankly at Su Yi; he didn't do anything, because he was incapable of doing anything.