Heart of the Sword

Why do the same martial arts moves, performed by different people, have completely different powers? The amount of true energy in the body, the flow of true energy in the meridians, the posture when performing the move, and the movement trajectory of the body will all affect the power of the move. These are four generally recognized principles. But Lu Jianxin knew that his emotions and mental state when making moves were also a huge influencing factor. After the country is destroyed and the family is destroyed, when your loved ones leave you, can the sword in your hand still move straight forward?