Leibniz is unclear about the nature of pleasure. In some texts, he describes pleasure as a perception of perfection, while in other texts he describes pleasure as being caused by a perception of perfection. In this article, I disambiguate two senses of “perception of perfection”, which clarifies Leibniz’s considered position. I argue that pleasure is a perception of an increase in a substance’s power which is caused by a substance’s knowledge of a perfection of the universe or God. This reading (...) helps clarify the nature of Leibnizian happiness. Happiness is a cognitive process (akin to a mood), constituted fundamentally out of pleasure, which is grounded in increases in a substance’s power. A rational substance will sustain its happiness so long as it is more powerful than it is weak, and it is engaging in activities that increase its power. (shrink)

Leibniz puts forward an intriguing argument against the moral permissibility of chattel slavery in a text from 1703. This argument has three independent layers or sub-arguments. The first is that slavery violates natural rights. The second is that moral laws such as the principles of equity and piety oppose slavery, or at least severely limit the permissible actions toward slaves. The third and final layer is that slavery can at most be justified if the slave is permanently incapable of conducting (...) herself well. Yet, it is very doubtful that any actual human beings satisfy that description. This paper analyzes and evaluates Leibniz’s argument, which scholars have so far largely neglected. Even though some elements of the argument are not original to Leibniz, it is of considerable importance for the scholarship of early modern philosophy: it sheds light on Leibniz’s views not only on the moral status of slavery itself, but also on moral rights and obligations more generally. (shrink)

El objetivo principal del presente trabajo de investigación es esclarecer el papel de la alteridad y el reconocimiento en Leibniz, tanto en su lógica de la alteridad y su teoría de la justicia universal, como en su fundamentación ontológica en la naturaleza expresiva y composible de los espíritus. Para lograr este objetivo, he dividido esta investigación en dos partes: en la primera parte busco mostrar en qué medida la alteridad y el reconocimiento son indispensables para comprender la filosofía práctica del (...) hannoveriano; mientras que en la segunda busca analizar la naturaleza expresiva y composible de los espíritus, a fin de articular una incipiente fundamentación ontológica de la moral leibniziana. (shrink)

Leibniz frequently argued that reasons are to be weighed against each other as in a pair of scales, as Professor Marcelo Dascal has shown in his article "The Balance of Reason." In this kind of weighing it is not necessary to reach demonstrative certainty – one need only judge whether the reasons weigh more on behalf of one or the other option However, a different kind of account about rational decision-making can be found in some of Leibniz's writings. In his (...) article "Was Leibniz's Deity an Akrates?" Professor Jaakko Hintikka has argued that Leibniz developed a new vectorial model for rational decisions which is better suited to complicated decisions, where values are complementary to each other. This model, related closely to his work in metaphysics and the philosophy of mind, is a heuristic device which helps in finding rational combinations - and in an ideal case an optimum - between plural inclinations to the good. I shall argue that Leibniz applies more or less implicitly both of these models in his practical rationality. In simple situations he applied the pair of scales model and in more complicated situations he applied the vectorial model. (shrink)

One of the features of John Locke’s moral philosophy is the idea that morality is based on our beliefs concerning the future good. In An Essay Concerning Human Understanding II, xxi, §70, Locke argues that we have to decide between the probability of afterlife and our present temptations. In itself, this kind of decision model is not rare in Early Modern philosophy. Blaise Pascal’s Wager is a famous example of a similar idea of balancing between available options which Marcelo Dascal (...) has discussed in his important 2005 article “The Balance of Reason”. -/- Leibniz, however, was not always satisfied with this kind of simple balancing. In his commentary to Locke’s Essay, Nouveaux essais sur l’entendement humain, II, xxi, §66, he presented an alternative model which is based on an idea of plural, mutually conflicting inclinations. This kind of model, called as vectorial theory of rational decision by Simo Knuuttila, fits well with Leibniz’s theory of the soul where volitions are formed as a kind of compromise between different inclinations to different goods. -/- I will present these two models and show how they illustrate the practical rationality of Locke and Leibniz and how their moral philosophies differ, although being similar in certain respects. The topics include Leibniz’s criticism of Lockean hedonism and the discussion of akratic behaviour in II, xxi of Essay and Nouveaux essais. (shrink)