From Gene Sharp (born 1928), founder of the Albert Einstein Institution, a non-profit organization dedicated to advancing the study of nonviolent action, retired professor of political science at the University of Massachusetts Dartmouth, From Dictatorship to Democracy: A conceptual framework for liberation, (1994):
The degree of liberty or tyranny in any government is in large degree a reflection of the relative determination of the subjects to be free and their willingness and ability to resist efforts to enslave them.