And for the same reason the Arabs shake hands with both hands, for giving one hand is like giving half of one's magnetism, but by giving both hands you show that you keep nothing back. The Persians touch the heart, which suggests the friendly feeling expressed from the bottom of the heart, that the greeting is not merely superficial, that it comes from the very depth of feeling. Among a great many people belonging to different parts of the world there is a custom of greeting by embracing one another, and no doubt there is a great psychical meaning in this.