This paper is a revised version of the Royal Institute of Philosophy’s Annual Lecture, 2016. It discusses the demands of critical reasoning in ethical arguments, and focuses in particular on the assessment of justice. It disputes the belief that reasoning about choice remains unfinished until an optimal alternative has been identified. A successful closure of a reasoning may identify a maximal alternative, which is not judged to be worse than any other available option. A maximal alternative need not be optimal in the sense of being ‘best’ (that is, at least as good as every other alternative). Critically sound reasoning can lead us to a partial ordering yielding a maximal alternative that is not optimal. The compulsive search for an optimal alternative needlessly limits the reach of reasoning in ethics.

This paper contrasts two metaphysical accounts of modality and properties: Modal Realism which treats possible entities as primitive; and Strong Dispositionalism in which metaphysical possibility and necessity are determined by actually existing dispositions or powers. I argue that Strong Dispositionalism loses its initial advantages of simplicity and parsimony over Modal Realism as it is extended and amended to account for metaphysical rather than just causal necessity. Furthermore, to avoid objections to its material and formal adequacy, Strong Dispositionalism requires a richer fundamental ontology which it cannot explicate without appealing either to possible worlds or to an account of counterfactual truth conditions, both of which Strong Dispositionalism was intended to replace.

Aristotle distinguishes friendships of pleasure or utility from more valuable ‘character friendships’ in which the friend cares for the other qua person for the other's own sake. Aristotle and some neo-Aristotelians require such friends to be fairly strictly symmetrical in their separateness of identity from each other, in the degree to which they identify with each other, and in the degree to which they are virtuous. We argue that there is a neglected form of valuable friendship – neither of pleasure nor utility – that allows significant asymmetries. We know of no sustained discussion of such ‘asymmetrical’ friendships in the literature.

This paper examines the discussion concerning temporal vacua, originated by Shoemaker's famous 1969 paper, in connection to relationism about time – roughly, the view that time is nothing over and above a network of relations between things. A novel solution to the problem allegedly constituted by temporal vacua is presented, which turns out to call for, and support, a formulation of relationism that differs from the usual ones. In particular, it is argued that relationism requires neither actual nor merely possible modifications in the qualities or positions of things, and can be made entirely independent of the notion of change.

This dialogue is on the nature of thought and thinking. The five disputants are Socrates, an imaginary neuroscientist from California (whose opinions reflect those of contemporary cognitive neuroscientists), an Oxford don from the 1950s (who employs the linguistic analytic techniques of his times), a Scottish post-doctoral student, and John Locke (who speaks for himself). The discussion takes place in Elysium in the late afternoon. They examine the idea that thinking is an activity of the mind or the brain, whether the medium of thought consists of words or ideas, whether thoughtful speech is speech accompanied by thought, whether thinking, i.e. reasoning and inferring, is a process, and what is meant by the claim that ‘thinking is the last interpretation’. The dialogue ends when the protagonists go to dinner, but will be resumed after the meal.