For just as a man who has never left his country usually imagines that the mores and customs of foreigners are completely contrary to reason because they are contrary to the custom of his city, by which he allows himself to be guided, so a child who has never left the paternal house imagines that the feelings and manners of his parents are the universal rule; or rather it never occurs to him that there could be other principles of reason or virture besides the imitation of them.