The English works of Thomas Hobbes of Malmesbury, Volume 01 (of 11)

In Short

This collection marks the opening of a comprehensive philosophical project, primarily focusing on "Body"—the physical nature of the universe. It serves as a systematic inquiry into the properties of space, time, cause and effect, and the geometric principles governing motion. By stripping away metaphysical speculation and grounding knowledge in definitions and logic, the text aims to provide a reliable framework for understanding the natural world. It has remained a vital document in the history of science and philosophy because it represents a bold, uncompromising effort to apply the precision of mathematics to the chaotic variety of sensory experience, essentially treating the physical world as a vast, predictable machine. It is a work of architectural ambition that demands total intellectual focus from its reader.

The Story

The intellectual journey begins by establishing the necessity of language and definition. Knowledge, here, is not an act of mystical discovery but one of disciplined construction. The argument posits that if a person acts alone, words serve as mere markers for their own internal memory; when shared with others, they become signs. By carefully defining terms and resolving complex ideas into their simplest components, the reader learns to navigate the hazards of equivocation and logical fallacy. The text warns that many errors in human thought arise from confusing the "copula" (the "is" in a proposition) with the subjects themselves, and it demands that we reduce every obscure statement to a categorical form to avoid absurdity.

From this linguistic foundation, the inquiry moves into the nature of existence. Space is defined as the magnitude of a body, and the text maintains a strict, almost stubborn, insistence on the rules of physical presence: two bodies cannot occupy the same place, and one body cannot occupy two places at once. This section sets the stage for a mechanical view of the universe, where "power" is not an inherent magical quality of an object but a conditional relationship between an agent and a patient. If an act is not impossible, it is possible; if it is possible, it will eventually be produced by the necessary concurrence of causes. This leads to a rigorous exploration of geometry and proportion, where the movement of lines and surfaces is analyzed through the lens of continuous motion.

The narrative shifts from abstract geometry to the physical world of "Sidereal Philosophy." Here, the author examines the earth, the planets, and the celestial sphere. While acknowledging that one can only truly know what one can demonstrate—and admitting that some astronomical phenomena remain difficult to fully explain—the text uses its mechanical principles to account for the eccentricities of planetary paths. It posits that these movements might be explained by the varying physical constitutions of the planet's surfaces as they rotate toward the sun.

As the work concludes its first volume, it pivots toward the sensory and the atmospheric. It examines the nature of light, heat, color, and sound, viewing them all as ripples of motion moving through a medium. Whether discussing why breath can both heat and cool, why ice freezes, or the mechanics of thunder and lightning, the author remains committed to a single, consistent explanation: the collision of atoms and the transmission of impetus. The final passages look forward to the next stage of the project—the study of human optics and the "manners of men"—yet they end with a firm, characteristic dismissal of any theory of gravity that relies on "innate appetite," insisting instead that the earth acts upon objects through a physical, albeit still mysterious, force of attraction.

How It Unfolds

The linguistic foundation The work opens by arguing that speech and naming are the necessary tools for retaining thought and communicating truth. It establishes that precise definitions are the only way to avoid the deceptive labyrinths of scholastic disputation.

The mechanics of space The focus shifts to the physical properties of bodies, defining space as that which is possessed by a matter. It rigorously demonstrates that physical objects are bound by clear, measurable limits, precluding the possibility of a body existing in two places at once.

The logic of causality The text develops the concept of "plenary power," arguing that nothing happens without the concurrence of both an agent and a patient. This establishes a world where events are the inevitable, mechanical outcomes of preceding causes, stripping away notions of spontaneous, uncaused motion.

The geometric proofs A substantial portion of the volume is dedicated to the mathematical demonstration of proportions and figures. These chapters act as a bridge between abstract logic and the physical world, showing how the laws of geometry mirror the behavior of moving matter.

The celestial and atmospheric inquiry The scope expands to the stars and the weather, applying the previously established laws of motion to planetary orbits and atmospheric events. It attempts to explain complex phenomena like lightning, ice, and sound through the interaction of small, invisible parts.

The People

The central figure of this work is the author himself, Thomas Hobbes. He does not act as a narrator but as a master-instructor, guiding a student through a process of rigorous intellectual purification. He is characterized by a deep, almost combative skepticism toward traditional philosophy, which he views as a collection of "absurdities" and "distinctions" designed to hide ignorance rather than illuminate truth. He wants to replace this with a system based solely on definitions and clear ratiocination.

Standing in his way are the "scholastic" thinkers and philosophers of the past. Hobbes treats them as antagonists who have allowed their language to become cluttered and their logic to become tainted by supernatural or animistic explanations. He is particularly dismissive of those who attribute "appetite" or "desire" to inanimate objects, such as those who claim heavy bodies fall because they "want" to reach the center of the earth. For Hobbes, these thinkers are guilty of laziness; they have failed to seek the true, material cause of motion.

The "student" or reader is also a central figure, though a passive one. This person is required to perform the internal work of "resolution"—breaking down every complex term until they reach a simple, undeniable truth. The student is transformed from a learner who accepts the authority of masters into one who possesses the "art of synthesis," capable of constructing truth for themselves. By the end of the text, the reader is expected to be different: no longer prone to being deceived by the variety of human speech, but instead armed with a cold, mechanical, and highly precise understanding of how the world functions.

In Its Own Voice

For the nature of a definition is to define, that is, to determine the signification of the defined name, and to pare from it all other signification besides what is contained in the definition itself.

The author explains the primary purpose of a definition in the process of philosophical inquiry.

Heavy bodies, therefore, being once cast upwards, cannot be cast down again but by external motion.

The author rejects the idea that inanimate objects have an internal "appetite" or "desire" to fall toward the earth.

For what is acute in sound, the same is subtle in matter; and both of them, namely acute sound and subtle matter, consist of very small parts, that of time, and this of the matter itself.

The author attempts to provide a consistent, materialist explanation for why some sounds are sharper than others.

What It's Really About

The fundamental question driving this work is: "How can we be certain of anything?" The answer provided is a radical, early-modern form of materialism. The book attempts to prove that the universe is not a spiritual or teleological entity, but a purely physical one where everything—including human thought, perception, and emotion—is a byproduct of matter in motion.

The argument underneath the technical chapters is a plea for intellectual transparency. By insisting that all truths are either definitions or derived from definitions, the author seeks to eliminate the possibility of error caused by vague language. It is a work about the limits of human knowledge, suggesting that we can only understand the how of the world (the mechanics of motion) rather than the why (the ultimate purpose). It rejects the idea of a "hidden" world, insisting that if a thing exists, it must be observable in its effects, and if it is not observable, it is not a subject for philosophy.

Why Read It Today

Reading this work is a strenuous exercise in 17th-century intellectual discipline. A modern reader will find it both strikingly modern and archaic. Its core commitment to materialism—the idea that the world is a physical system governed by laws—prefigures the scientific worldview that we take for granted today. However, the path taken to reach these conclusions is paved with long, dense sections of geometric proofs and categorical logic that may feel alien to those accustomed to modern, more narrative-driven philosophical texts.

You will love this book if you are interested in the history of ideas and the origins of the scientific method. There is a distinct, bracing pleasure in watching a mind like the author's relentlessly sweep away the "rubbish" of centuries of confused thinking. It feels like watching a master carpenter strip away layers of rot from an old house to reveal the original, sturdy beams.

Be warned: the prose is formal, the language is occasionally archaic, and the text expects the reader to engage with complicated diagrams and long chains of syllogistic reasoning. The author’s period attitudes—particularly his dismissal of any philosophy that does not match his own rigid, mechanical standards—can feel arrogant or narrow-minded to a contemporary reader. Yet, what stays with you is the sheer, uncompromising ambition of the project. It is a monument to the human desire to master the world through intellect alone. If you approach it not as a source of easy answers, but as a window into the birth of a new way of seeing, you will find it to be an exhilarating, if difficult, companion.