The very purpose of a Bill of Rights was to withdraw certain subjects from the vicissitudes of political controversy, to place them beyond the reach of majorities and officials and to establish them as legal principles to be applied by the courts. One's right to life, liberty, and property, to free speech, a free press, freedom of worship and assembly, and other fundamental rights may not be submitted to vote; they depend on the outcome of no elections.(Emphasis from Ol' Backwoods.)
By the way, 'vicissitudes' roughly means ebb and flow, changing this way and that. You know, like HopenchangeTM.
What Justice Jackson is saying here is that this ain't a democracy, it's a constitutional republic, and fundamental rights can't just be voted away. Just because politicians can cobble together a majority in Congress, doesn't mean you lose your right to free speech, or right to petition the government for justice, or right to privacy, or the right to a speedy trial with a jury of your peers. Yeah, I know, they've been doing all these things for years, but they shouldn't be able to.
And the right to keep and bear arms falls in the same category: it cannot be voted away like the US Senate will try to do tomorrow.
US v. Heller established that the right to keep and bear arms is a fundamental and individual right. McDonald v. Chicago established that the states and cities must obey the 2nd Amendment as stating a fundamental and individual right.
Fundamental rights can't be voted away. You can't have a vote on the Bill of Rights in Congress. It is illegitimate, and those that try are committing treason against the Oath to protect and defend the Constitution.
Talk show host Mark Levin had an awesome rant on this last night. The video is below. Enjoy.