Steven Tester

Georg Christoph Lichtenberg (1742–99) is perhaps best known for his aphoristic writings collected in his Sudelbücher (Waste Books) and his critique of the substantial view of the self in which he argues that we should say “it thinks,” that is, “thinking is happening” rather than “I think.” However, Lichtenberg also reflects in the Waste Books and his lectures on physics on a wide range of issues in epistemology and metaphysics concerning realism and idealism that inform his thoughts on the natural sciences. In this paper, I argue that Lichtenberg rejects epistemological realism in favor of idealism and that he focuses on the heuristic and explanatory value of scientific theories rather than their ability to depict nature accurately as it is independent of our minds. I show how his reflections on idealism and the uses of scientific theories also inform his positions on natural laws, causation, induction, and debates between atomists and dynamists about the nature of matter and the cause of gravity.

Kant’s claim in the Subjective Deduction that we have multiple fundamental mental powers appears to be susceptible to some a priori metaphysical arguments made against multiple fundamental mental powers by Christian Wolff who held that these powers would violate the unity of thought and entail that the soul is an extended composite. I argue, however, that in the Second Paralogism and his lectures on metaphysics, Kant provides arguments that overcome these objections by showing that it is possible that a composite could ground the unity of thought, that properties are powers and therefore the soul could possess multiple powers, and the soul is a thing in itself so it cannot be an extended composite. These arguments lend additional support to the attribution of multiple mental powers to us in the Subjective Deduction.

Georg Christoph Lichtenberg is perhaps best known among English-speaking philosophers for his famous remark in which he suggests that on the basis of introspection we are warranted only in saying “it thinks,” or “thinking happens” instead of “I think.” In this and surrounding remarks, Lichtenberg criticizes rationalist metaphysics for positing a soul as a ground of our thoughts, perceptions, and representations and for claiming that personal identity consists in the persistence of this soul after the death of the body. In contrast with the rationalist metaphysics of the soul, he proposes a theory of the self according to which it is nothing more than a series of interconnected thoughts and representations..

The definitive scholarly edition of Georg Christoph Lichtenberg’s philosophical aphorisms. Admired by philosophers such as Schopenhauer, Nietzsche, Kierkegaard, Freud, Benjamin, and Wittgenstein, Georg Christoph Lichtenberg (1742–1799) is known to the English-speaking world mostly as a satirist. An eminent experimental physicist and mathematician, Lichtenberg was knowledgeable about the philosophical views of his time, and interested in uncovering the philosophical commitments that underlie our common beliefs. In his notebooks (which he called his Waste Books) he often reflects on, challenges, and critiques these philosophical commitments and the dominant views of the Enlightenment, German idealism, and British empiricism. This scholarly collection of Lichtenberg’s philosophical aphorisms contains hundreds of trenchant observations drawn from these notebooks, many of which have been translated into English here for the first time. It also includes a historical and philosophical introduction to his writings, situating him in the history of philosophy and ideas, and is supplemented with a chronology, suggestions for further reading, and extensive introductory and textual notes explaining his references.

There has recently been a growing interest in the topic of vagueness and indeterminacy in contemporary metaphysics, with two views taking center stage. The semantic view holds that indeterminacy is due to vagueness in the extension of concepts, while the ontological view holds that indeterminacy is due to the vagueness of certain objects. There has, however, been little research on discussions of vagueness and indeterminacy in early-modern philosophy despite the relevance of vagueness and indeterminacy for issues such as real and nominal definitions, clear and distinct ideas, and the principle of complete determination. In this paper, I survey discussions of vagueness in Locke, Leibniz, and Kant and point to ways in which the problem of vagueness and indeterminacy touches on broader issues in their respective philosophies. Although Locke, Leibniz, and Kant all suggest that vagueness is a semantic phenomenon, Kant also appears to countenance an ontological view according to which objects as appearances may sometimes be indeterminate

This paper investigates the philosophy of the eighteenth-century German physicist Georg Christoph Lichtenberg (1742–1799), situating his views in the context of early-modern views of the self, and providing an interpretation and assessment of his remarks on self-consciousness and personal identity in his Waste Books. In these remarks, which include his famous observation that we are warranted only in saying “it thinks” rather than “I think,” Lichtenberg criticizes the rationalist metaphysics of the soul for confusing conceivability with cognizability and argues that we cannot know ourselves to be a persisting substantial self on the basis of the observations of inner sense. We are justified only in claiming that the self is a series of interrelated conscious representations and sensations. Lichtenberg’s rejection of the substantial self in favor of this view of the self also leads him to conclude in other remarks that personal identity consists in the continuity of consciousness produced by memory regardless of the material basis upon which consciousness supervenes.