The reason I regard training that involves the ki energy as crucial is because ki energy is the bridge that links our body and mind. . . when you focus deeply inside on the ki energy, your mind becomes calm and serene. There's a feeling of peaceful comfort and safety that's hard to describe. Inside of that, there's no fear that you might lose something, there is no desperate need to control others, nor is there the desire for recognition or acceptance. There is only one self that is infinitely bright and peaceful and seems that for it anything would be possible.