- Bourgeois class domination is undoubtedly an historical necessity, but, so too, the rising of the working class against it. Capital is an historical necessity, but, so too, its grave digger, the socialist proletariat.
- The modern proletarian class doesn't carry out its struggle according to a plan set out in some book or theory; the modern workers' struggle is a part of history, a part of social progress, and in the middle of history, in the middle of progress, in the middle of the fight, we learn how we must fight... That's exactly what is laudable about it, that's exactly why this colossal piece of culture, within the modern workers' movement, is epoch-defining: that the great masses of the working people first forge from their own consciousness, from their own belief, and even from their own understanding the weapons of their own liberation.
- The leadership has failed. Even so, the leadership can and must be recreated from the masses and out of the masses. The masses are the decisive element, they are the rock on which the final victory of the revolution will be built. The masses were on the heights; they have developed this 'defeat' into one of the historical defeats which are the pride and strength of international socialism. And that is why the future victory will bloom from this 'defeat'. 'Order reigns in Berlin!' You stupid henchmen! Your 'order' is built on sand. Tomorrow the revolution will already 'raise itself with a rattle' and announce with fanfare, to your terror: I was, I am, I will be!
- What is our task in the question of peace? It does not consist merely in vigorously demonstrating at all times the love of peace of the Social Democrats; but first and foremost our task is to make clear to the masses of people the nature of militarism and sharply and clearly to bring out the differences in principle between the standpoint of the Social Democrats and that of the bourgeois peace enthusiasts.
- The friends of peace in bourgeois circles believe that world peace and disarmament can be realised within the frame-work of the present social order, whereas we, who base ourselves on the materialistic conception of history and on scientific socialism, are convinced that militarism can only be abolished from the world with the destruction of the capitalist class state.
- Militarism in both its forms - as war and as armed peace - is a legitimate child, a logical result of capitalism, which can only be overcome with the destruction of capitalism, and that hence whoever honestly desires world peace and liberation from the tremendous burden of armaments must also desire Socialism. Only in this way can real Social Democratic enlightenment and recruiting be carried on in connection with the armaments debate.
- The Utopianism of the standpoint which expects an era of peace and retrenchment of militarism in the present social order is plainly revealed in the fact that it is having recourse to project making. For it is typical of Utopian strivings that, in order to demonstrate their practicability, they hatch 'practical' recipes with the greatest possible details. To this also belongs the project of the 'United States of Europe' as a basis for the limitation of international militarism.
- Plausible as the idea of the United States of Europe as a peace arrangement may seem to some at first glance, it has on closer examination not the least thing in common with the method of thought and the standpoint of social democracy . . . At the present stage of development of the world market and of world economy, the conception of Europe as an isolated economic unit is a sterile concoction of the brain. Europe no more forms a special unit within world economy than does Asia or America.
- The times when the centre of gravity of political development and the crystallising agent of capitalist contradictions lay on the European continent, are long gone by. To-day Europe is only a link in the tangled chain of international connections and contradictions.
- Freedom only for the members of the government, only for the members of the Party - though they are quite numerous - is no freedom at all. Freedom is always the freedom of dissenters. The essence of political freedom depends not on the fanatics of 'justice', but rather on all the invigorating, beneficial, and detergent effects of dissenters. If 'freedom' becomes 'privilege', the workings of political freedom are broken.
- Marxism is a revolutionary worldview that must always struggle for new revelations. Marxism must abhor nothing so much as the possibility that it becomes congealed in its current form. It is at its best when butting heads in self-criticism, and in historical thunder and lightning, it retains its strength.
- Franz Mehring, the biographer of Marx, did not exaggerate when he called Rosa Luxemburg the best brain after Marx. But she did not contribute her brain alone to the working-class movement; she gave everything she had - her heart, her passion, her strong will, her very life. ~ Tony Cliff
- A passion for truth made Rosa Luxemburg recoil from any dogmatic thought. In a period when Stalinism has largely turned Marxism into a dogma, spreading desolation in the field of ideas, Rosa Luxemburg's writings are invigorating and life-giving. Nothing was more intolerable to her than bowing down to 'infallible authorities'. As a real disciple of Marx she was able to think and act independently of her master.~ Tony Cliff
- During a period when so many who consider themselves Marxists sap Marxism of its deep humanistic content, no one can do more to release us from the chains of lifeless mechanistic materialism than Rosa Luxemburg. For Marx communism (or socialism) was 'real humanism', 'a society in which the full and free development of every individual is the ruling principle'. ~ Tony Cliff
- With a will, determination, selflessness and devotion for which words are too weak, she consecrated her whole life and her whole being to Socialism. She gave herself completely to the cause of Socialism, not only in her tragic death, but throughout her whole life, daily and hourly, through the struggles of many years ... She was the sharp sword, the living flame of revolution. ~ Clara Zetkin, her closest friend.