I argue for a novel interpretation of Leibniz’s conception of the kind of contingency that matters for freedom, which I label ‘agential contingency.’ In brief, an agent is free to the extent that she determines herself to do what she judges to be the best of several considered options that she could have brought about had she concluded that these options were best. I use this novel interpretation to make sense of Leibniz’s doctrine that the reasons that explain free actions are merely inclining and not necessitating.

In my comments on Karin de Boer’s Kant’s Reform of Metaphysics, I pose five questions. First, I ask how the fundamental principle of practical philosophy that Kant identifies and claims is fundamentally different from Wolff’s is consistent with the claim that Kant is reforming Wolff’s metaphysics. Second, I ask whether De Boer thinks that Kant, as a reformer of Wolff, continues to accept the Principle of Sufficient Reason (or some variant thereof). Third, I ask whether De Boer accepts Wolff’s conception of analytic judgements, especially as applied to the fundamental principles of metaphysics, and if she does not, how Kant can be reforming rather than rejecting Wolff’s metaphysics. Fourth, I ask what De Boer’s argument is for thinking that Kant is not begging the question against Wolff in thinking that a priori cognition needs schemata. Fifth, I ask how De Boer understands the division of labour between the Transcendental Analytic and the Transcendental Dialectic in establishing the claims of metaphysics.

Leibniz's principle of sufficient reason (PSR) is the claim that everything has a sufficient reason. But is Leibniz committed to the necessity or to the contingency of his great principle? I argue that Leibniz is committed to its contingency, given that he allows for the absolute possibility of entities that he claims violate the PSR. These are all cases of qualitatively indiscernible entities, such as indiscernible atoms, vacua, and bodies. However, Leibniz's commitment to the contingency of the PSR seems to stand in tension with his inference of the PSR from his theory of truth. I argue that this apparent tension can be resolved satisfactorily. When it comes to his modal views on the PSR, Leibniz's position is entirely consistent.

In her Discourse on Happiness, Émilie du Châtelet argues susceptibility to illusion is one of the five ‘great machines of happiness,’ and that ‘we owe most of our pleasures to illusions’ (2009: 349). However, many who read the Discourse find this aspect of her view puzzling and in tension with her claims that we must always seek truth and obey reason. To understand better her claims in the Discourse on Happiness, this article explores Du Châtelet's discussions of illusions in her Foundations of Physics, On Liberty, and the Dissertation on the Nature and Propagation of Fire. I distinguish four types of illusions that Du Châtelet posits and clarify the ways in which these relate to her views on happiness and love in the Discourse and argue that she avoids deceptive or perpetual illusions of happiness through the use of the principle of sufficient reason.

Most of Spinoza’s arguments for God’s existence do not rely on any special feature of God, but instead on merely general features of substance. This raises the following worry: those arguments prove the existence of non-divine substances just as much as they prove God’s existence, and yet there is not enough room in Spinoza’s system for all these substances. I argue that Spinoza attempts to solve this problem by using a principle of plenitude to rule out the existence of other substances and that the principle cannot be derived from the PSR, as many claim.

Abbreviation: PSR: Principle of Sufficient Reason

Schopenhauer's claim that the essence of the world consists in Wille encounters well-known difficulties. Of particular importance is the conflict of this metaphysical claim with his restrictive account of conceptuality. This paper attempts to make sense of Schopenhauer's position by restoring him to the context of post-Kantian debate, with special attention to the early notebooks and Fourfold Root of the Principle of Sufficient Reason. On the reconstruction suggested here, Schopenhauer's philosophical project should be understood in light of his rejection of post-Kantian metaphilosophy and his opposition to German Idealism.