„Pity for poverty, enthusiasm for equality and freedom, recognition of social injustice and a desire to remove it, is not socialism. Condemnation of wealth and respect for poverty, such as we find in Christianity and other religions, is not socialism. The communism of early times, as it was before the existence of private property, and as it has at all times and among all peoples been the elusive dream of some enthusiasts, is not socialism. The forcible equalization advocated by the followers of Baboeuf, the so-called equalitarians, is not socialism. In all these appearances there is lacking the real foundation of capitalist society with its class antagonisms. Modern socialism is the child of capitalist society and its class antagonisms.“
— Wilhelm Liebknecht
No Compromise – No Political Trading (1899), 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.