Contact makes people friends, though neither the contact of mortals nor friendship is everlasting. Being together, sitting together, eating together, breathing the same air, bring hearts closer. Two burning coals close together in time make one fire; the flames unite them. When the two hands are joined, an electric current goes from one hand to the other. This is the reason for the custom of shaking hands, that the flame in the two people may meet. This is why people have a tendency to clasp their hands, fold their arms and cross their legs when sitting or lying, for it comforts them. This is the reason of the affinity existing between those of the same nation or race.