"One whose spirit and mental strength have been strengthened by sparring with a never-say-die attitude should find no challenge too great to handle. One who has undergone long years of physical pain and mental agony to learn one punch, one kick, should be able to face any task, no matter how difficult, and carry it through to the end. A person like this can truly be said to have learned karate."

Source : Gichin Funakoshi (1994). “Karate-dō Nyūmon: The Master Introductory Text”, p.47, Kodansha International

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