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knowing what is right and not doing it is a lack of courage
A classical proverb from the Analects of Confucius, often quoted in formal or literary contexts to admonish moral inaction.
「義を見てせざるは勇なきなり」という言葉は、正しいと知りながら行動しないことを戒めている。
The saying 'knowing what is right and not doing it is a lack of courage' warns against failing to act when one knows what is right.