Throughout history, the really fundamental changes in societies have come about not from dictates of governments and the results of battles but through vast numbers of people changing their minds -- sometimes only a little bit.
Some of the changes have amounted to profound transformations -- for instance the transition from the Roman Empire to Medieval Europe, or from the Middle Ages to modern times. Others have been more specific, such as the constitution of democratic governments in England and America, or the termination of slavery as an accepted institution. In the latter cases, it is largely a matter of people recalling that no matter how powerful the economic or political or even military institution, it persists because it has legitimacy, and that legitimacy comes from the perceptions of people. People give legitimacy and they can take it away. A challenge to legitimacy is probably the most powerful force for change to be found in history.
To the empowering principle that the people can withhold legitimacy, and thus change the world, we now add another: By deliberately changing the internal image of reality, people can change the world. Perhaps the only limits to the human mind are those we believe in.
Willis Harman -- Global Mind Change