You have a cup in front of you. When you drink water, it becomes a water cup; when you smoke, it becomes an ashtray; when you arrange flowers, it becomes a vase; the cup itself is actually nothing—this is called emptiness; what you use it for is what it truly is—this is called skillful means. If you insist that it must be a cup, this is called attachment to form. For this reason, you argue and debate with others, which is called ego clinging. As a result, your arguing leads to emotions and insults, which is called affliction. Finally, you develop aversion towards this person, which is called prejudice. Then, you realize that in fact, there are no others in this world—only yourself. When you are present, the world exists with you; when you leave, the world disappears with you. Those others, those entanglements, those attachments, those controls—all are just various conflicts within your own mind. Thus, you understand again the saying: "Originally, there is nothing at all; where can dust settle?"