"[Marx's] enquiry into wage-labour is initiated from the point of view of a
division of labour between self-employed producers (farmer meets
cloth-maker), and proceeds to analyze the dual nature of labour:
concrete (labour has use value) and abstract (it produces exchange
value)." Dauvé, Value, Time, and Communism
"The totality of our so-called knowledge or beliefs, from the most
casual matters of geography and history to the profoundest laws
of atomic physics or even of pure mathematics and logic, is a
man-made fabric which impinges on experience only along the edges." Quine, The Verification Theory and Reductionism
"What we know is `So-and-so has a mind which has such and such properties' but we do not know `A has such and such properties', where A is
the mind in question. In such a case, we know the properties of a
thing without having acquaintance with the thing itself, and without,
consequently, knowing any single proposition of which the thing itself
is a constituent." Russell, On Denoting
