《三国志·魏书·董二袁刘传》
谋士田丰劝说袁绍偷袭曹军后方，但袁绍因为自己儿子生病拒绝了他的建议，田丰用手杖敲地说： 现在遇上这种天赐良机，但却因为婴儿生病而错失了行动的机会，痛惜啊！ 
田丰说绍袭太祖后，绍辞以子疾，不许，丰举杖击地曰： 夫遭难遇之机，而以婴儿之病失其会，惜哉！ 
The advisor Tian Feng advised Yuan Shao to attack Cao's rear, but Yuan Shao refused his suggestion because his son was ill. Tian Feng hit the ground with his staff and said, "Now that we have such a great opportunity given by heaven, we miss the chance to act because of a baby's illness. How sad!" 