Leibniz often refers to the Principle of Sufficient Reason (PSR) as something like a first principle. In some texts, however, he attempts to give positive arguments in its favor. I examine two such arguments, and find them wanting. The first argument has two defects. First, it is question-begging; and second, when the question-begging step is excised, the principle one can in fact derive is highly counter-intuitive. The second argument is valid, but has the defect of only reaching a nearly trivial (...) conclusion. (shrink)

Si Dios es la razón suficiente del mundo, entonces parece seguirse que todos los eventos son consecuencia necesaria de un ser necesario. Para evadir esta conclusión, Leibniz formula en la década de 1670 una concepción modal que funda la contingencia en un rasgo lógico e intrínseco de las ideas de las cosas: la posibilidad de concebir la idea contraria sin contradicción. Hacia 1686, Leibniz complementa esta primera concepción con lo que considera su solución definitiva al problema de la contingencia: la (...) teoría del análisis infinito. Sin embargo, en otros escritos de ese año, propone dos vías alternativas de fundamentación de la contingencia. Este trabajo sugiere que esa pluralidad de modelos explicativos converge en una concepción integral de las modalidades que subyace como trasfondo de la reflexión modal leibniziana. If God is the sufficient reason for this world, then it seems to follow that every event is a necessary consequence of a necessary being. in order to avoid this conclusion, Leibniz states, during the 1670's, a modal conception that grounds contingency on a logical feature which is intrinsic to the ideas of things: the possibility of conceiving the opposite idea without contradiction. Towards 1686, Leibniz complements this first conception with what he considered to be his definitive solution to the problem of contingency: the theory of infinite analysis. However, in other writings from the same year, he proposes two different ways to explain contingency. This paper suggests that this plurality of models converges in a global conception of modalities, which lies at the background of Leibniz's modal thought. (shrink)

En sus últimos años, Leibniz emplea el concepto de necesidad moral para cualificar la elección divina de lo óptimo. Sin embargo, Leibniz no explica este concepto con precisión. El presente trabajo intenta mostrar que la necesidad moral leibniziana no puede entenderse como una modalidad puramente deóntica, porque ello contraría los fundamentos metafísicos que hacen al carácter teleológico de su ética. El artículo propone también una interpretación del contenido alético de tal noción, basada en la conexión necesaria que Leibniz parece atribuir (...) a la relación entre la voluntad y la tendencia al bien. Dicha necesidad afirmaría que, aun cuando toda elección es contingente, en tanto entraña una infinidad de consideraciones, el Dios leibniziano está metafísicamente necesitado a seguir el criterio de lo mejor. In his last years, Leibniz employs the concept of moral necessity to qualify God's choice of the best. However, he doesn't explain this concept accurately. This paper intends to show that leibnizian moral necessity cannot be conceived as a purely deontic modality, because it would be contrary to the metaphysical grounds which make Leibniz's ethics strictly teleological. This paper also proposes an interpretation of the alethic content of this concept, based on the necessary connection that Leibniz seems to assign to the relationship between free will and the tendency towards good. What this necessity entails is that, for Leibniz, even though the infinity of reasons involved makes every choice contingent, God is metaphysically necessitated to follow the rule of the best. (shrink)