
Without these it could not be. Socialism and ethics are two separate things. This fact must be kept in mind. Whoever conceives of socialism in the sense of a sentimental philanthropic striving after human equality, with no idea of the existence of capitalist society, is no socialist in the sense of the class struggle, without which modern socialism is unthinkable. Whoever has come to a full consciousness of the nature of capitalist society and the foundation of modern socialism, knows also that a socialist movement that leaves the basis of the class struggle may be anything else, but it is not socialism.
No Compromise – No Political Trading (1899)