In which publication did the great 19ty-century liberal philosopher John Stuart Mill explain the harm principle, of exercising power over others only to protect them from harm?
Harm principle:  John Stuart Mill articulated this principle in "On Liberty", where he argued that, "The only purpose for which power can be rightfully exercised over any member of a civilized community, against his will, is to prevent harm to others." John Stuart Mill: John Stuart Mill (20 May 1806 – 8 May 1873) was an English philosopher, political economist and civil servant.
On Liberty