《国语·楚语·观射父论祀牲》
观射父回答说： 上天的事刚健威武，大地的事柔顺温文，百姓的事忠诚有信。 
对曰： 天事武，地事文，民事忠信。 
Guan Shefu replied: Heavenly matters are strong and formidable; earthly matters are soft and gentle; people's matters are loyal and trustworthy.