“Our program was a scientific one it must be constantly changed at minor points to meet the continuous advance of science. And I maintain that no man – Marx, in spite of his comprehensive and deep intellect, as little as any other – can bring science to final perfection; and this position is for everyone who understands the nature of science a foregone conclusion. No socialist, therefore, has the right to condemn attacks on the theoretical ideas of the Marxian teachings or to excommunicate any one from the party because of such attacks. But it is wholly different when such attacks imply a complete overturning of our whole conception of society, as, for example, is the case with Bernstein. Then vigorous defense is in order. Far more dangerous than theoretical assaults are practical disavowals of our principles. Theoretical discussions interest only a comparatively small portion of our membership; whereas practical disavowal of principles and tactical offenses against the party program touch every party comrade and arouse the attention of every party comrade; and when they are not quickly checked and corrected they bring confusion into the whole party.”

No Compromise – No Political Trading (1899)

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Wilhelm Liebknecht 53
German socialist politician 1826–1900

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