 The very notion of an ontologically simple being will be dismissed by many as self-evidently incoherent. Among theists, there are those who will argue that DDS does not cohere with some other theistic commitment such as the doctrine of the Trinity. The main concern of this article is not with such intramural coherence questions, but with the question of whether or not DDS is coherent at all. This broad coherence question is not whether the doctrine is true, or even possibly true; the question is whether it is possible for us to think it without obvious contradictions and category mistakes. Ultimately, the broad coherence question concerns the sort of general metaphysical framework that would allow DDS to be discussed as a live option as opposed to being dismissed as incoherent from the outset.