While I hope that my colleagues will provide some more alternative, not to say "revolutionary," resources, let me suggest a "librarianish" standby: the book of quotations.

From the website www.bartleby.com you can get to 3 different sourcebooks of quotation, Bartlett's, Simpson's, and Columbia World of Quotations. Searching "revolution" in each of those will yeild short poetic "definitions" from sources ranging from John Adams to Hannah Arendt to Mao Zedong. I would recommend selecting each resource separately from the drop down menu, rather than leaving the default "All Quotations" search, so as to get the "flavor" of each different resource (though there is much overlap).

An addition benefit to using these old workhorses is that they may suggest names for further research. While the citations are often not as thorough as one might like, it will at least provide a pointer.