We have already indicated that all ownership of property is predicated on moral understanding.

So basic is this understanding that it is nearly universally adopted, although its adoption has not always followed identical forms or procedures.

We speak of a person who behaves "properly" or who is "proper".

The root of "proper" in the sense of correct (moral) behavior is the same as the root of the word "property".  Proper behavior is thus at its root behavior that recognizes and respects the proprietary rights of owners over their property.  Moral behavior is proprietary behavior.

Every truly immoral act in the world (and we exclude here actions that are merely deemed "illegal") is nothing more nor less than anti-proprietary behavior, or in other words, an act which is a violation of the property boundary of a property owner.