Jerusalem as Capitol: What the Bible says.

We’re told in Zech. 12: 2 -3 that Jerusalem would become a cup of trembling. “Behold, I am about to make Jerusalem a cup of staggering to all the surrounding peoples. On that day, I will make Jerusalem a heavy stone for all the peoples. All who lift it will surely hurt themselves. And all the nations of the earth shall gather against it?  unto all the people round about, when they shall be in the siege.” Zech. 12-2-3

What impact should this verse have on the Christian or concerned citizen?