Liberty
John Stuart Mill, in his work, On Liberty, was the first to recognize the difference between liberty as the freedom to act and liberty as not being forced to do something.  Mill also sought to define the "nature and limits of the power which can be legitimately exercised by society over the individual” and as such, he describes an inherent and continuous antagonism between liberty and authority and thus, the prevailing question becomes "how to make the fitting adjustment between individual independence and social control".