The paradox that Goethe highlights is that materialism understands itself to be the champion of empiricism, when really it detaches us from the world as we experience it, in the name of objectivity. "All theory, dear friend, is grey," he wrote. "But the golden tree of actual life springs ever green."
This, of course, is the same point Paul Feyerabend makes is something quoted in an earlier post today. I have been arguing for years that imagination is the integrating faculty of intelligence.