"You shall not covet your neighbor's house; you shall not covet your neighbor's wife, his manservant, his maid-servant, his ox, his ass, nor anything that is your neighbor's."
The Tenth Commandment is somewhat difficult: most other commandments involve control or regulation of actual physical acts -- this one encroaches on our very thoughts
How could you demand from a person not to be overtaken by jealousy? When I walk into your home and observe your lifestyle -- how could I not become envious?
Do not look into your neighbor’s tent to help decide what you should be doing. Your decisions in life should not be based on what other people are, or are not, doing.
Instead of answering the chassid's question, Rabbi DovBer dispatched him to the town of Zhitomir. "Go visit my disciple, Rabbi Zev" he said. "Only he can provide you with the answer you seek"