The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.
去爱就是冒着不被爱的风险。去希望就是冒着痛苦的风险。去尝试就是冒着失败的风险,但必须冒险,因为人生最大的危险就是不去冒险。