The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

It's funny how things work out.

认为仅仅因为理解了行为改变就会发生，这是领导力发展中最大的误区之一。

If a Nation expects to be ignorant and free in a state of civilization,it expects what never was and never will be....If we are to guard against ignorance and remain free,it is the responsibility of every American to be informed."

我们不是因为变老而停止玩耍，而是因为停止玩耍而变老。