The Book of Tea contains an excerpt I love:

One day Soshi was walking on the bank of a river with a friend. “How delightfully the fishes are enjoying themselves in the water!” exclaimed Soshi. His friend spake to him thus: “You are not a fish; how do you know that the fishes are enjoying themselves?” “You are not myself,” returned Soshi; “how do you know that I do not know that the fishes are enjoying themselves?”