On Liberty Is A Compilation Of Mill’s Thoughts And Ideas On Liberty And Individual Freedom. Mill Believed That Individuality Was A Basic Element Of The Well-being Of Man, And This Is What He Tries To Convey In This Book. A Leading Proponent Of Utilitarianism, Mill Was The Voice Of Nineteenth Century Liberalism. He Disapproved Of Capitalism And Democracy, And Believed That All Human Beings Have Equal Rights.