"Your voice is a very powerful weapon. When you are in tune with the cosmic breath of heaven and earth, your voice produces true sounds. Unify body, mind, and speech, and real techniques will emerge."
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Source : Morihei Ueshiba, John Stevens (2010). “The Art of Peace”, p.7, Shambhala Publications
Source : Jerome Lawrence, Robert E. Lee (2016). “Inherit the Wind: The Powerful Courtroom Drama in which Two Men Wage the Legal War of the Century”, p.17, Ballantine Books