All history is nothing but a continuous transformation of human nature.

Surplus-value and the rate of surplus-value are... the invisible essence to be investigated, whereas the rate of profit and hence the form of surplus-value as profit are visible surface phenomena

The more the division of labor and the application of machinery extend, the more does competition extend among the workers, the more do their wages shrink together.

A spectre is haunting Europe-the spectre of Communism. All the Powers of old Europe have entered into holy alliance to exorcise this spectre: Pope and Czar, Metternich and Guizot, French Radicals and German police-spies. Where is the Party in opposition that has not been decried as Communistic by its opponents in power? Where the Opposition that has not hurled back the branding reproach of Communism, against the more advanced opposition parties, as well as against its reactionary adversaries?

Communism begins where atheism begins.

Under private property, each tries to establish over the other an alien power, so as thereby to find satisfaction of his own selfish need. The increase in the quantity of objects is therefore accompanied by an extension of the realm of the alien powers to which man is subjected, and every new product represents a new potentiality of mutual swindling and mutual plundering.

The Communists have no need to introduce free love; it has existed almost from time immemorial.