Many of the worlds' greatest thinkers and warriors have been telling us the same thing. Ueshiba, Tesla, Hirano, Laban, Tohei, Solomon. The influential school of jujutsu, Kitoryu, was all about the waxing and waning of energy. Henry Kono said (in essence) that he didn't understand aikido until he realized that Ueshiba was talking about yin-yang, and the implications of that.
Karl Geis was fond of telling us, "You can do anything you want if you have perfect timing."
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