Roman Catechism 32.25

Chapter 32 — Part III: The Decalogue — The Ninth and Tenth Commandments

Section 25. "Thy Neighbour's" — The word neighbour is mentioned in this Commandment to mark the wickedness of those who habitually covet the lands, houses and the like, which lie in their immediate vicinity; for neighbourhood, which should make for friendship, is transformed by covetousness from a source of love into a cause of hatred.