Woodrow Wilson... recognized that the Constitution is best understood not as a machine at all but as a living thing. What he did not add was that it's a living thing with no body or mind, no moving parts for organs or spirit separate from the bodies and minds and spirits of the people themselves, people whose constant vigilance- and I noticed when I was coming into the building (National Archives] that statement "Eternal vigilance is the price of liberty," appropriate to have on the archives - people whose constant vigilance is the lifeblood of Constitutional survival. Explain in about 50 words what the passage means.