Wealth which, when obtained, increases the enemy's prosperity, or which, though obtained, is repayable to the enemy, or which causes loss of men and money, is dangerous wealth; for example, wealth which is enjoyed in common by neighbouring kings and which is acquired at their expense; or wealth which is asked for by an enemy; or wealth which is seized like one's own property; or wealth which is acquired in the front and which causes future troubles or provokes an enemy in the rear; or wealth which is obtained by destroying a friend or by breaking a treaty and which is therefore detested by the Circle of States--all these are the varieties of dangerous wealth.