point that they break the continuity between 41:25–29 and 42:8–9 and therefore must have been inserted at that point. It is generally difficult and often impossible to prove that a particular passage has been interpolated, and the existence of an interpolation is not established by the mere fact that, when the passage in question is removed, the remaining text does not bleed. Another problem with Duhm’s theory is the assumption that the four Dichtungen originated as one composition (“ein besonderes