Justice is one of the four cardinal virtues in classical European philosophy and Roman Catholicism. It is the moderation or mean between selfishness and selflessness - between having more and having less than one's fair share. Justice is closely related, in Christianity, to the practice of Charity (virtue) because it regulates the relationships with others. It is a cardinal virtue, which is to say "pivotal" because it regulates all such relationships, and is sometimes deemed the most important of the cardinal virtues.