In this paper I defend a new reading of the final argument of the Gigantomachia passage of Plato’s Sophist (249b5–249c9), according to which it is an argument for a two-kind ontology, based on the distinction between the changing beings and the unchanging beings. This argument, I urge, is addressed not only to Platonists but to all philosophers – with one exception. My reading is based on the claim that this argument does not rely on the view that nous requires unchangeable (...) objects – what I call the traditional reading – but on the view that nous itself is unchanging. The difference between the traditional reading and my reading is that on the former, Plato’s argument relies on a distinctive epistemological assumption, whereas on the latter, Plato’s argument is free from any such commitments. If the argument of this paper is along the right lines, then this implies that this argument has a much more far-reaching scope than critics have usually assumed. It also invites us to reconsider Plato’s approach to the question of being in the Sophist. (shrink)