Abstraction (n.) is the alienation by which culture makes itself known to each individual.
Abstraction (n.) is easy to make from real fruits and impossible to turn back into them: you cannot reach the opposite of an abstraction without giving it up.
Abstraction (n.) is not only something thinkers do; society performs one every day when it reduces all labor to time.
Abstraction (n.) reaches its most general form only where concrete development is richest — the general appears when one feature is shared by many.
Abstraction (n.) is not always idle: value making itself independent is industrial capital in action, which those who call it 'a mere abstraction' forget.