The abolition of private property has become not only possible but absolutely necessary. ... The outcome can only be the victory of the proletariat. - Friedrich Engels

From the moment when labour can no longer be converted into capital, money, or rent, into a social power capable of being monopolized, i.e., from the moment when individual property can no longer be transformed into bourgeois property, into capital, from that moment, you say individuality vanishes.

This political economy or science of enrichment born of the merchants' mutual envy and greed, bears on its brow the mark of the most detestable selfishness.

Once the first radical attack on private property has been launched, the proletariat will find itself forced to go ever further, to concentrate increasingly in the hands of the state all capital, all agriculture, all transport, all trade. All the foregoing measures are directed to this end; and they will become practicable and feasible, capable of producing their centralizing effects to precisely the degree that the proletariat, through its labor, multiplies the country's productive forces.