John Stuart Mill Quotes
The maxim is, that whatever can be affirmed (or denied) of a class, may be affirmed (or denied) of everything included in the class. This axiom, supposed to be the basis of the syllogistic theory, is termed by logicians the dictum de omni et nullo.
Mill, John Stuart. A System of Logic, Ratiocinative and Inductive, vol. 1, John W. Parker, 1843, p. 209.
John Stuart Mill, usually cited as J. S. Mill, was an English philosopher, political economist, Member of Parliament, and civil servant. One of the most influential thinkers in the history of classical liberalism, he contributed widely to social theory, political theory, and political economy. Dubbed "the most influential English-speaking philosopher of the nineteenth century", he conceived of liberty as justifying the freedom of the individual in opposition to unlimited state and social control.