We shall now pass on to the second rule of morals of individual man; this rule protects not the life but the property of the human person, whatever his social group, against unlawful attack. The first problem we have to tackle is to know the causes that decided the laying down of this rule. How are we to explain this respect that the property of others inspires—a respect that the law endorses by means of penal sanctions? How does it happen that things should attach so closely to the person that they share his inviolability? It would demand long research and method to deal with such a question, which is simply the origin of the right of ownership. But some outstanding points at least can be fixed.