What is that Marx quote I forget

[Kléber]

Someone help me.

It's the one where he says something like "I didn't actually come up with that much, previous thinkers already defined the social classes and the relations between them and mapped out history blabla.. i only made a couple additions to socialist theory, they are ________" or something like that.

PLEASE if someone knows the quote im talking about.. >_<

[Aurora]

And now as to myself, no credit is due to me for discovering the existence of classes in modern society or the struggle between them. Long before me bourgeois historians had described the historical development of this class struggle and bourgeois economists, the economic anatomy of classes. What I did that was new was to prove:
(1) that the existence of classes is only bound up with the particular, historical phases in the development of production,
(2) that the class struggle necessarily leads to the dictatorship of the proletariat,
(3) that this dictatorship itself only constitutes the transition to the abolition of all classes and to a classless society.

[Kléber]

Thanks :)