Picked this up from nathanomir.
What is mine is mine and what is yours is yours. This is average. What is mine is yours and what is yours is mine. This is folly. What is mine is mine and what is yours is mine. This is wickedness. What is mine is yours and what is yours is yours. This is righteousness. -- Old Rabbinical saying
Wow! That is deep ... and I wish I had seen it years ago!