The Eleatic Principle or causal criterion is a causal test that entities must pass in order to gain admission to some philosophers’ ontology. This principle justifies belief in only those entities to which causal power can be attributed, that is, to those entities which can bring about changes in the world. The idea of such a test is rather important in modem ontology, since it is neither without intuitive appeal nor without influential supporters. Its supporters have included David Armstrong (1978, Vol2, 5), Brian Ellis (1990, 22) and Hartry Field (1989, 68) to name but a few.

Clearly though, if such a principle is to be anything more than just a statement of a certain version of physicalism, it must be argued for. In this paper I will look at the arguments that have been put forward for the principle and suggest some problems for each of these.

In his papers ‘Semantic Paradox (1979)’ and ‘The Liar Paradox: Tangles and Chains (1982),’ Tyler Burge provides a hierarchical solution to the Liar paradox. And in his paper ‘Epistemic Paradox (1984)’ Burge extends his hierarchy approach to the epistemic paradox of belief instability, which I shall explain shortly. Although Burge's views on the Liar paradox have been widely criticized (e.g., Gupta 1982, Grim 1991), his views on the paradox of belief instability have not received notable attention (except Conee 1987). In this paper I shall argue that Burge's proposal is inadequate as a solution to the paradox of belief instability. For this purpose, I shall criticize Burge's claim that a circular evaluation of a thought (or a belief) is impossible, which is crucial for his proposal. The question of whether or not a circular evaluation of belief is possible is of its own philosophical interest as well.

In a dense and fascinating article of some ten years ago, Toomas Karmo adds his voice to the chorus of philosophers who deny the possibility of soundly deriving ‘ought’ from ‘is.’ According to Karmo, no derivation containing an ethical conclusion and only non-ethical premises can possibly be sound, where ‘sound’ describes a deductively valid derivation all of whose premises are true. He also suggests that the only valid derivations of ‘ought’ from ‘is’ will be trivial ones. His argument has, to my knowledge, gone unrebutted; on the contrary, it has won recent endorsements, some philosophers evidently believing that he has finally put to rest the issue of the logical autonomy of ethics. Against that trend, I intend to rebut his argument, both by falsifying the taxonomy on which his argument relies and by offering a nontrivial and potentially sound ‘is’-‘ought’ derivation of my own.

While many philosophers have found Hegel's critique of Kantian ethics to be interesting in certain respects, overall most tend to find it rather shallow and to think that Hegel either misunderstands Kant's thought or has a rather crude understanding of it. For example, in examining the last two sections of Chapter V of the Phenomenology— ‘Reason as Lawgiver’ and ‘Reason as Testing Laws’ (where we get an extended critique of the categorical imperative)- Lauer finds Hegel's treatment to be truncated and inadequate. The only trouble, though, is that like most other readers of the Phenomenology, Lauer does not recognize that Hegel had been examining and criticizing Kantian ethics throughout a much greater part of—indeed, more than half of—Chapter V. Once we do understand this, I think we must concede that Hegel's treatment is hardly truncated and that it cannot be described as shallow or inadequate. I will try to show that Hegel demonstrates a rather sophisticated understanding of, and gives a serious and thorough critique of, Kantian practical reason.