Lu has made great achievements in "grasping summer and wax". However, Lu has always attached importance to brotherhood. Seeing that many brothers died in Fang La, I was puzzled by Song Jiang's enthusiasm for fame and fortune and felt "disheartened". As for "listen to the tide and be round, see the letter and be silent", some people think it is the awe of Lu from heaven. In fact, there are traces to follow.

Enlightenment means to see through and open your heart. If you want to' open', you must have a' knot'. Heart is like dying embers' is the expression of' knot'. The solution of "heart knot" is of course a great revelation!

The letter came from Qiantang River, and I didn't know I was me until today.