We shall never go wrong if we do what is opposed to the interests of our enemy. On the other hand, we shall almost never go right if we do what our enemies applaud. Historical development is a continuous conflict, a conflict of interests, a conflict of races, a conflict of classes. And if friendship does not count even in ordinary business, how much less so in such a conflict. Good-naturedness and sentimentality have no place in politics. They have never won a victory, but have brought unnumbered defeats. Bluecher’s motto, “Always follow the cannon’s roar and throw yourself upon the enemy,” is the best rule also in .

All parties without exception recognize us as a political power, and exactly in proportion to our power. Even the craziest reactionary that denies us the right of existence courts our favor and by his acts gives the lie to his words. From the fact that our assistance is sought by other parties, some of our comrades draw the strange conclusion that we should reverse the party tactics, and in place of the old policy of the class struggle against all other parties, substitute the commercial polities of log rolling, wire pulling and compromise. Such persons forget the power which makes our alliance sought for, even by our bitterest enemies, would have had absolutely no existence were it not for the old class struggle tactics. If Marx, Engels and Lassalle had accepted from Bernstein and his modest or not modest fellow thinkers the tactics of compromise and dependence upon bourgeois parties, then there never would have been any Social Democracy; we would have been simply the tail of the Progressive party.

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.

We come more and more frequently into momentary unions, or momentary relations with other parties. But these momentary relations must never become momentary alliances. We must never bind the party. We must always keep our hand free; exploit the conditions; let our opponents do the dirty work for us; and with the goal of the party firmly in mind, keep in the middle of the road, and go our own way, only going along with opposing parties when our way happens to be the same as theirs. That we are a party of the class struggle, who have nothing in common with any other party, and who have to fight and conquer all other parties, in order to attain our goal, is something which we must never for a moment lose sight of.

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.

The class instinct of the bourgeoisie is far better developed than that of the proletariat. The governing class naturally knows its interests better than the governed, who have so much less opportunity to become informed and are also sometimes intentionally, and sometimes not, systematically deceived and misled from a recognition of their interests. Do not say that it is the rough form in which socialism is often set forth that frightens and embitters the bourgeoisie. That is absolutely false. It is not the form; it is the content which they detest; and the more harmless the form so much the more dangerous do the contents appear to the gentlemen of the bourgeoisie. The fineness of the form makes no difference to them. That is clear from the manner in which they fight out their quarrels among themselves.

The internationality of socialism is a fact that is daily becoming more evident and more significant. We socialists are one nation to ourselves, – one and the same international nation in all the lands of the earth. And the capitalists with their agents, instruments and dupes are likewise an international nation, so that we can truthfully say, there are to-day only two great nations in all lands that battle with each other in the great class struggle, which is the new revolution – a class struggle on one side of which stands the proletariat, representing socialism, and on the other the bourgeoisie, representing capitalism. While the bourgeois world of capitalism continues and the bourgeoisie rules, so long are all states necessarily class states, and all governments class governments, serving the purposes and interests of the ruling class, and destined to lead the class struggle for the bourgeoisie against the proletariat – for capitalism against socialism, for our enemies and against us. From the standpoint of the class struggle which is the foundation of militant socialism, that is a truth which has been raised by the logic of thought and of facts beyond the possibility of a doubt. A socialist who goes into a bourgeois government, either goes over to the enemy or else puts himself in the power of the enemy. In any case the socialist who becomes a member of a bourgeois government separates himself from us, the militant socialists. He may claim to be a socialist but he is no longer such. He may be convinced of his own sincerity, but in that case he has not comprehended the nature of the class struggle – does not understand that the class struggle is the basis of socialism.

Diversity of opinions on theoretical points is never dangerous to the party. There are for us no bounds to criticism, and however great our respect may be for the founders and pioneers of our party, we recognize no infallibility and no other authority than science, whose sphere is ever widening and continually proves what it previously held as truths to be errors; destroys the old decayed foundations and creates new ones; does not stand still for an instant; but in perpetual advance moves remorselessly over every dogmatic belief.