For liberals, the question is never whether borders should be completely open or closed; a society open to all would have no rights worth protecting, while a society closed to all would have no rights worth emulating. If one is looking for an abstract principle to follow on questions of immigration, liberalism cannot provide it.
对于自由主义者来说，问题永远不在于边界是否应该完全被打开或关闭的问题；一个对所有人都开放的社会不会有值得保护的权利，而一个对所有人都关闭的社会不会有值得仿效的权利。如果有人要寻找在移民问题上的抽象原则，那他是不会在自由主义上寻找到的。