 These problems emerge because the priority between mind and world in Mill’s work is unclear: the mind is seen as both the condition for the representation of the only world we ever encounter, and as a natural object within the world. The former is brought to the foreground only in Mill’s most philosophical moments—the latter is present throughout Mill’s characterisation of scientific and ordinary thinking. One option to resolve this tension, of course, is to follow Kant in distinguishing transcendental and empirical levels of reflection—another is to follow the post-Kantian idealists in attempting to unite and overcome such oppositions wherever they occur. Mill, however, never worked through the internal pressures of his own position with sufficient rigour to feel the push within naturalism towards these  positions.[4]