Progress, Moscow, (1976)The premises from which we begin are not arbitrary ones, not dogmas,
but real premises from which abstraction can only made in the imagination.
They are the real individuals, / their activity and the material
conditions of their life, both those which they find already existing
and those produced by their activity. The premises can thus be verified
in a purely empirical way. Marx \& Engels 1976, 36-37.