A couple of quotes that seem appropriate for the Wikipedia experience:
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt." --Bertrand Russell
"Think like an organism, behave like a cell." --Preston Jordan
Experience that guides my membership in the Wikipedia edit
The Wikipedia has gotten amazing over the years despite all the real and hypothetical problems with a wide-open collaborative environment. This is a surprising and inspiring testament to the goodness and intelligence of people in general — or at least the subset of people that has figured out how to edit a wiki page.