By political equality Social-Democrats mean equal rights, and by economic equality, as we have already said, they mean the abolition of classes. As for establishing human equality in the sense of equality of strength and abilities (physical and mental), socialists do not even think of such things.
Vladimir Lenin, "A Liberal Professor on Equality", 1914. Reprinted in Lenin on the United States, International Publishers, 1970, (p. 94), and in Lenin: Collected Works, Progress Publishers, 1972, Moscow, Volume 20, (p.145).