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To every ?-consistent recursive class ? of formulae there correspond recursive class signs r, such that neither v Gen r nor Neg (v Gen r) belongs to Flg (?) (where v is the free variable of r).
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Proposition VI, On Formally Undecidable Propositions in Principia Mathematica and Related Systems I (1931)
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Informally, recursive systems of axioms cannot be complete.

 

Kurt Godel

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The working class must be emancipated by the working class.
Woman must be given her true place in society by the working class.
Child labor must be abolished by the working class.
Society must be reconstructed by the working class.
The working class must be employed by the working class.
The fruits of labor must be enjoyed by the working class.
War, bloody war, must be ended by the working class.

 

Eugene V. Debs

 

The traveler to the United States will do well, however, to prepare himself for the class-consciousness of the natives. This differs from the already familiar English version in being more extreme and based more firmly on the conviction that the class to which the speaker belongs is inherently superior to all others.

 

John Kenneth Galbraith

 

I believe in non-violent methods of struggle as most effective in the long run for building up successful working class power. Where they cannot be followed or where they are not even permitted by the ruling class, obviously only violent tactics remain. I champion civil liberty as the best of the non-violent means of building the power on which workers rule must be based. If I aid the reactionaries to get free speech now and then, if I go outside the class struggle to fight against censorship, it is only because those liberties help to create a more hospitable atmosphere for working class liberties. The class struggle is the central conflict of the world; all others are incidental.

 

Roger Nash Baldwin

 

Absolute truth belongs only to one class of humans ... the class of absolute fools.

 

Ashley Montagu

 

Not a single problem of the class struggle has ever been solved in history except by violence... The class struggle did not accidentally assume its latest form, the form in which the exploited class takes all the means of power in its own hands in order to completely destroy its class enemy, the bourgeoisie...

 

Vladimir Lenin