For Marx, as for Hegel, the dialectic takes note of the fact that the negation inherent in reality is ‘the moving and creative principle’. The dialectic is the ‘dialectic of negativity’. Every fact is more than a mere fact; it is a negation and restriction of real possibilities. Wage labor is a fact, but at the same time it is a restraint on free work that might satisfy human needs. Private property is a fact, but at the same time it is a negation of man’s collective appropriation of nature. - Herbert Marcuse, Reason and Revolution, p 282.