No Compromise – No Political Trading (1899) 
Context: This foundation of the class struggle, which Marx – and this is his immortal service – has given to the modern labor movement, is the main point of attack in the battle which the bourgeois political economy is waging with socialism. The political economists deny the class struggle and would make of the labor movement only a part of the bourgeois party movements, and the Social Democracy only a division of the bourgeois democracy. The bourgeois political economy and politics direct all their exertions against the class character of the modern labor movement. If it were possible to create a breach in this bulwark, in this citadel of the Social Democracy, then the Social Democracy is conquered, and the proletariat thrown back under the dominion of capitalistic society. However small such a breach may be in the beginning, the enemy has the power to widen it and the certainty of final victory. And the enemy is most dangerous when he comes as a friend to the fortress, when he slinks in under the cover of friendship, and is recognized as a friend and comrade. The enemy who comes to us with open visor we face with a smile; to set our foot upon his neck is mere play for us. The stupidly brutal acts of violence of police politicians, the outrages of anti-socialist laws, the anti-revolution laws, penitentiary bills – these only arouse feelings of pitying contempt; the enemy, however, that reaches out the hand to us for a political alliance; and intrudes himself upon us as a friend and brother, – him and him alone have we to fear. Our fortress can withstand every assault – it can not be stormed nor taken from us by siege – it can only fall when we ourselves open the doors to the enemy and take him into our ranks as a fellow comrade. Growing out of the class struggle, our party rests upon the class struggle as a condition of its existence. Through and with that struggle the party is unconquerable; without it the party is lost, for it will have lost the source of its strength. Whoever fails to understand this or thinks that the class struggle is a dead issue, or that class antagonisms are gradually being effaced, stands upon the basis of bourgeois philosophy.
                                    
“For in the end what is at issue in this idea of the cooperative is as clear as day. It is a means of preparing the daily bourgeois stew [pot-au-feu bourgeois] at all costs, divorced from any political thought, from any revolutionary struggle. It is the political and social abdication of the proletariat under the pretext of socialism; indeed it is not even that! Everyone is careful to insist and to prove that socialism has nothing to do with it, which is the truth.”
"Letter to Blanqui’s Supporters in Paris" (18 April 1866)
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Louis Auguste Blanqui 6
French socialist and political activist 1805–1881Related quotes
                                        
                                        Interview by Hanns Johst in Frankforter Volksblatt (January 27, 1934), quoted in David Schoenbaum, Hitler's Social Revolution: Class and Status in Nazi Germany, 1933–1939 (New York: NY, W. W. Norton & Company, 1997), p. 57 
1930s
                                    
What is to be Done? (1902)
Source: The Birth of Fascist Ideology: From Cultural Rebellion to Political Revolution, 1994, pp. 27-28
                                        
                                        World Within World (1951) 
Context: I am for neither West nor East, but for myself considered as a self — one of the millions who inhabit the earth... If it seems absurd that an individual should set up as a judge between these vast powers, armed with their superhuman instruments of destruction I can reply that the very immensity of the means to destroy proves that judging and being judged does not lie in these forces. For supposing that they achieved their utmost and destroyed our civilization, whoever survived would judge them by a few statements. a few poems, a few témoignages [testimonies] surviving from all the ruins, a few words of those men who saw outside and beyond the means which were used and all the arguments which were marshaled in the service of those means.
Thus I could not escape from myself into some social situation of which my existence was a mere product, and my witnessing a willfully distorting instrument. I had to be myself, choose and not be chosen... But to believe that my individual freedom could gain strength from my seeking to identify myself with the "progressive" forces was different from believing that my life must be an instrument of means decided on by political leaders. I came to see that within the struggle for a juster world, there is a further struggle between the individual who cares for long-term values and those who are willing to use any and every means to gain immediate political ends — even good ends. Within even a good social cause, there is a duty to fight for the pre-eminence of individual conscience. The public is necessary, but the private must not be abolished by it; and the individual must not be swallowed up by the concept of the social man.
                                    
Source: The Russian Revolution (1918), Chapter Five, "The Question of Suffrage"
Source: The Managerial Revolution, 1941, p. 71; cited in: Robert Manley (ed) (1962) Age of the manager http://archive.org/stream/ageofmanager00manl#page/n15/mode/2up. p. xiii
                                        
                                        "Two Tactics of Social Democracy in the Democratic Revolution" 
1900s, The Two Tactics of Social Democracy (1905)