Hugh Samuel Roger Elliot, Dictionary of National Biography… (1912)
“ In the second volume, part iv., 'Justice,' is Spencer's final and most philosophic statement of the duties of the state. As in his earliest book, he limits state-functions to the maintenance of justice at home, and the repelling of aggression abroad. His formula of justice is stated by him in the words: 'Every man is free to do that which he wills, provided he infringes not the equal freedom of any other man.' Two further divisions indicate the duties of men towards one another, which are not, however, to be enforced by law. ”
