Two geese

A Jew comes to Rabbi:
- Rabbi, I have two geese: white and grey. I need to cook one of them but I don't know which one.
- Cook the white one.
- But, they were two friends: grey goose will sorrow for the white goose.
- Then cook the grey.
- But, then white goose will sorrow for the grey goose.
- Cook both.
- But, I love them both. And I need to cook only one of them.
- Well, I don't know what else I can advise… Wait, across the street there is an orthodox church - ask the priest.
The Jew goes to the priest and says:
- I don't belong to your confession but my Rabbi advised me to ask you this question: I have two geese: white and grey. I need to cook one of them but I don't know which one.
- Cook the white one.
- But, they were two friends: grey goose will sorrow for the white goose.
- Damn him!