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The Muʿtazilī theologians, particularly the later Imāmī ones, developed numerous interesting arguments against divine command theory. The arguments, however, have not received the attention they deserve. Some of the arguments have been discussed in passing, and some have not been discussed at all. In this article, I aim to present and analyse the arguments. To that end, I first distinguish between different semantic, ontological, epistemological, and theological theses that were often conflated in the debate, and examine the logical relation among them. Then I go over the Muʿtazila's arguments determining, among other things, which of the theses was targeted by each argument. In presenting the arguments, I focus mainly on the late kalām period, the period falling roughly between the thirteenth and fifteenth centuries of the common era, as the arguments were at their most sophisticated level by this time.

In our scientific as well as everyday discourse, we frequently categorize things. Some things are animate, while others are inanimate. Some things are sapient, while others are not. Some things are blue, some are green, some are red, and so on. According to some philosophers, all categorizations are subjective. On such subjectivist views, there is nothing about the external world which explains our actual categorizations; the categorizations are, rather, mere projections of our mind or language onto the world. In contrast, working in the Aristotelian framework, Avicenna maintained that at least some categorizations have their root in objective reality, that they are not Abstract: A main function of common natures in Avicenna's metaphysics is supposed to be providing an objective ground for the categories. Thus, it is commonly assumed that in his metaphysics things are objectively divided into the categories into which they are because members of each category share the same common nature. However, common natures cannot perform the function unless they are shared, in a real sense of the word, by the members of the respective categories, and it is not clear at all in what real sense Avicenna took common natures to be shared by them. On the one hand, he rejected Platonic and Aristotelian realisms about common natures, the two standard accounts of how common natures are shared by their instances. On the other hand, it is unclear that his alternative account(s) of common natures renders them genuinely common. The primary goal of this paper is to examine whether Avicenna's common natures can provide an objective ground for the categories. It considers various interpretations of Avicenna's account and argues that they are either incorrect interpretations of Avicenna or do not render common natures genuinely common. It concludes with proposing to look elsewhere in Avicenna's system to find the objective ground.