The production of life, both of one’s own labour and of fresh life in procreation … appears as a twofold relation: on the one hand as a natural, on the other as a social relation.
– Marx and Engels, German Ideology
If individual A had the same need as individual B, and if both had realized their labour in the same object, then no relation whatever would be present between them; considering only their production, they would not be different individuals at all. Both have the need to breathe; for both the air exists as atmosphere; this brings them into no social contact; as breathing individuals they relate to one another only as natural bodies, not as persons.
– Marx, Grundrisse
Marxian Science is the science of the extra-conceptual irreducibility of use-value.
– Massimiliano Tomba, Marx’s Temporalities