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- There is no historical fact that did not owe its origin to social economics; but it is no less true to say that there is no historical fact that was not preceded, not accompanied, and not succeeded by a definite state of consciousness.
- The Materialist Conception of History, 1891, Ch. 6.
- Children like to work, and are always eager to imitate the work of adults.
- Utopian Socialism in the Nineteenth Century, 1913, Ch. 5.