The green mountains are lucky enough to bury the loyal bones, and the innocent white iron casts the sycophants. What does this couplet mean?

The first couplet "Qingshan is fortunate to bury loyal bones" writes that this place is lucky to be able to bury Yue Fei; the second couplet "White shackles cast innocent ministers" writes the statue of Qin Hui and his wife cast in white shackles in front of Yue Fei's tomb. People wrote about Bai Qian's innocence, but because of these two people, they were reviled day and night. The couplets use "green mountains are lucky" and "white iron is innocent". "Green Mountains" and "white iron" are dead things, and they are not "lucky" or "innocent" at all. However, the couplets are like this, and everything in the world seems to be All have humanity! Qingshan is originally taboo on graves because it will damage the "feng shui", but the couplet says that "Qingshan is lucky enough to bury the bones of loyal ministers." This is like even the mountain gods were moved by loyal ministers. They would rather ruin their own feng shui than be loyal neighbors! The next sentence "white iron casts innocent people into sycophants" has the same reason! It can be seen that the world also feels sorry for the loyal minister!