The whole struggle of our Party (and of the working class movement in Europe generally) must be directed against opportunism. The latter is not a current of opinion, not a tendency; it (opportunism) has now become the organised tool of the bourgeoisie within the working class movement.

When one makes a Revolution, one cannot mark time; one must always go forward--or go back

Russians are too kind, they lack the ability to apply determined methods of revolutionary terror.

But suppose, for the sake of argument, free competition, without any sort of monopoly, would develop capitalism trade more rapidly. Is it not a fact that the more rapidly trade and capitalism develop, the greater is the concentration of production and capital which gives rise to monopoly?

The only one who doesn't make mistakes is the one who doesn't do anything.

It would be the greatest mistake, certainly, to think that concessions mean peace. Nothing of the kind. Concessions are nothing but a new form of war.

Human knowledge is not (or does not follow) a straight line, but a curve, which endlessly approximates a series of circles, a spiral. Any fragment, segment, section of this curve can be transformed (transformed one-sidedly) into an independent, complete, straight line, which then (if one does not see the wood for the trees) leads into the quagmire, into clerical obscurantism (where it is anchored by the class interests of the ruling classes).