It is widely believed that Hume recognizes only two types of causality-one equivalent to a constant conjunction between two "objects," the other involving somesort of necessary connection between them. I will refer to these types, respectively, as "conjunction" and "necessity." I believe that Hume relies on a third type of causality-a process by which a constant conjunction of perceptions causes someone to acquire a mental habit. To remain close to Hume's terminology, I will refer to the process as "repetition." The main thesis of this paper is that this process, though causal, cannot be equated with either conjunction or necessity. Repetition is no small matter. It is the key to the correctness of Hume's overall account of causality and causal belief since it explains why humans have causal beliefs,why the causes they believe in need only be revealed in conjoined perceptions, and yet also why humans believe that a cause involves a necessary connection with its effect even though this belief is unverifiable.

This paper attempts a deduction of Kant's concept of the highest good: that is, it attempts to prove, in accordance with Dieter Henrich.s interpretation of the notion of deduction, that the highest good is an end that is also a duty. It does this by appealing to features of practical reason that make up the legitimating facts that serve as the premises that any deduction must possess. According to Kant, the highest good consists of happiness, virtue, and relations of proportionality and causation between happiness and virtue, such that happiness is proportional to and caused by virtue. I argue, by drawing on accepted Kantian notions, that Kant had compelling reasons for concluding that the highest good is in fact an end that is also a duty. If correct, then this argument provides the deduction promisedin my title.

According to the Myth of Er we are responsible for our character because we chose it before birth. But any choice is determined by our present character, sothere is an indefinite regress and we cannot be entirely responsible for our character. The Myth of Er can be seen as the first formulation of the problem of free will, which Aristotle demythologizes in Nicomachean Ethics III.5. Plato's solution is that freedom is compatible with causal determinism because it does not mean indeterminism but rationality. The myth links the individual lives to the harmony of the spheres, so our lives are determined not by blind necessity, but by rational necessity that follows from the nature of the universe. Even so, the limitations of determinism prevent rationality from being a sufficient cause of happiness (although the opposite view is usually attributed to Plato), but it remains a necessary one.