The only limits that exist are the ones you place on yourself.

The deterioration of every government begins with the decay of the principles on which it was founded.

国家是理性的行为者，在无政府状态的国际体系中寻求最大化其权力和安全。

Believe in yourself and anything is possible.

要解决复杂的问题，我们必须首先理解产生这些问题的系统。