Chapter 7, Part 6 - Lieh Tzu

Duke Wên of Chin put an army into the field with the intention of attacking the Duke of Wei, whereat Tzu Ch'u threw his head back and laughed aloud. On being asked the reason of his behavior, he replied: 'I was thinking of the experience of a neighbor of mine, who was escorting his wife on a visit to her own family. On the way, he came across a woman tending silkworms, who attracted him greatly, and he fell into conversation with her. Happening to look up, what should he see but his own wife also receiving the attentions of an admirer! It was the recollection of this incident that made me laugh.'

The Duke saw the point, and forthwith turned home with his army. Before he got back, an invading force had already crossed his northern frontier!

'As you behave to others, so others will behave to you. He who rides roughshod towards the accomplishment of his own desires, in the belief that it will not occur to others to do the like, will in all probability find himself circumstanced as above.'
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.