He nodded and said: "ordinary people practice sword technique and sabre technique step by step from the basic routine. It's a process from simple to complex! In battle after battle, experts will find their weakness in sword technique and sabre technique. Gradually improve, start to simplify the complexity, until finally to the point of returning to nature. From simple to complex, then from complex to simple. Until one move, all of them are powerful. Among them, we need to experience and understand again and again. Improve again and again. Until the last epiphany. This is comparable. From the beginning, we took heaven and earth as our teacher. Create simple and...