−『素問』陰陽応象大論篇第五。
この「柔剛」とはなんでしょうか。あまり聞き馴染みがない。寛文3年本『素問』、安政版『素問』では、「陰曰柔、陽曰剛」と注釈が書かれているのみ。『黄帝内経素問諺解』では、「形と氣の陰陽にそれぞれ剛柔がある」としています。形では陽柔陰剛、氣では陽剛陰柔となっています。また、「剛柔を分つとは蔵府を分つこと」であると書かれています。形（陰）と氣（陽）は反対の性質を持つものなので、剛柔もまた陰陽に分つと時の1つのやり方なのかもしれません。
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63* “By clearly understanding its yin and yang, one can distinguish between softness and hardness.”– “Somon” Yin-Yang-Osho-Tairon Volume 5.
What exactly is this “soft and hard”? It’s not a very familiar term. In the 1663 edition of the Suwen and the Ansei edition of the Suwen, there is only a note stating, “Yin is called soft, Yang is called hard.” In the Huangdi Neijing Suwen Yanjie, it states that “there is hardness and softness in both the yin and yang of form and qi.” In form, it is yang soft and yin hard, and in qi, it is yang hard and yin soft. It also states that “to distinguish between hard and soft is to distinguish between the internal organs.” Since form (yin) and qi (yang) have opposite properties, hardness and softness may also be one way of distinguishing between yin and yang.
