What I did that was new was ...

What I did that was new was to prove that the existence of classes is only bound up with particular, historical phases in the development of production; that the class struggle necessarily leads to the dictatorship of the proletariat; and that dictatorship itself only constitutes the transition to the abolition of all classes and to a classless society.
What I did that was new was to prove that the existence of classes is only bound up with particular, historical phases in the development of production; that the class struggle necessarily leads to the dictatorship of the proletariat; and that dictatorship itself only constitutes the transition to the abolition of all classes and to a classless society.
 Karl Marx

Quotes from the same author

Under private property, each tries to establish over the other an alien power, so as thereby to find satisfaction of his own selfish need. The increase in the quantity of objects is therefore accompanied by an extension of the realm of the alien powers to which man is subjected, and every new product represents a new potentiality of mutual swindling and mutual plundering.
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 Karl Marx
The wealthy man is the man whois much, not the one who has much
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 Karl Marx
The ruling ideas of each age have ever been the ideas of its ruling class.
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 Karl Marx
Labour is ... not the only source of material wealth, i.e, of the use-values it produces. As William Petty says, Labour is the father of material wealth, the earth is its mother.
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 Karl Marx
The social principles of Christianity preach cowardice, self-contempt, abasement, submission, humility, in a word all the qualities of the canaille
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 Karl Marx