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Thomas Hobbes
De Homine (On Man)
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De Homine (On Man)
The title De Homine is Latin for "On Man" or "Concerning Man."
Its simplicity reflects Hobbes's ambition to build a complete philosophical system.
His major philosophical works form a deliberate progression:
- De Corpore (1655) — On Body
- Examines matter, motion, geometry, logic, and the physical world.
- De Homine (1658) — On Man
- Applies the principles established in De Corpore to human beings.
- Discusses sensation, imagination, language, reasoning, emotions, and voluntary action.
- De Cive (1642) — On the Citizen
- Applies his understanding of human nature to political society.
- Explains why governments arise and why civil authority is necessary.
Although De Cive was published before the other two works, Hobbes intended these three books to constitute a unified philosophical system moving from nature → humanity → society.
The Meaning of "Man"
The title does not refer merely to "man" in the sense of the male sex. In seventeenth-century Latin, homo means the human being or humankind, whereas vir specifically denotes an adult male. Thus, De Homine is best understood as "On the Human Being."
Why the Title Matters
The title signals Hobbes's conviction that political philosophy cannot begin with governments or laws. It must first understand what a human being is.
For Hobbes:
- Human beings are material organisms.
- Thought arises from bodily processes.
- Passions motivate action.
- Reason calculates means rather than determining ultimate ends.
- Self-preservation is the most fundamental drive.
Only after establishing this account of human nature can one explain why people create governments.
One-Line Mental Anchor
De Homine = "Understand the human being before attempting to understand society."
De Homine (On Man)
1. Author Bio
Thomas Hobbes (1588–1679) was an English philosopher and political theorist whose ambition was to construct a complete philosophical system explaining nature, humanity, and society through the principles of matter and motion. Educated during the Scientific Revolution, he was profoundly influenced by Galileo Galilei (1564–1642) and the geometrical method of Euclid (fl. c. 300 BC). De Homine occupies the middle position in Hobbes's philosophical trilogy, linking his study of the physical world (De Corpore) to his political philosophy (De Cive and Leviathan).
2. Overview / Central Question
(a) Form & Length
- Genre: Philosophical prose; philosophical anthropology and psychology
- Length: Approximately 150–200 pages (varies by edition)
(b) Entire Book in ≤10 Words
- Human nature explained through body, perception, and reason.
(c) Roddenberry Question
"What's this story really about?"
What kind of being is a human person, and how do sensation, thought, desire, and action arise? Hobbes argues that understanding politics requires first understanding the machinery of human nature. Rather than beginning with laws or governments, he begins with perception, motion, appetite, and reason. The work remains significant because every philosophy of society ultimately depends upon some philosophy of the human person.
2A. Summary of the Entire Work
Hobbes begins by examining sensation, arguing that all knowledge originates in external objects acting upon the senses. Perception is not the reception of immaterial forms but the physical consequence of motion transmitted through the body. Imagination and memory are simply lingering effects of these sensory motions.
From perception he proceeds to language, reasoning, and the passions. Reason does not create desires but calculates the means by which desires may be fulfilled. Human behavior therefore results from the interaction of appetite, aversion, experience, and rational calculation rather than from abstract moral ideals.
The latter portions discuss voluntary action, freedom, and moral responsibility. Hobbes interprets liberty as the absence of external impediments rather than freedom from causal necessity. Human beings remain responsible because actions flow from their own desires, even though those desires arise through natural causes.
The book thus provides the anthropological foundation upon which Hobbes builds his political philosophy.
If human beings are naturally driven by self-preservation, desire, and competition, then political institutions must be designed with these realities rather than idealized conceptions of virtue in mind.
3. Special Instructions
This work is best understood as the bridge between Hobbes's natural philosophy and his political philosophy. It is less a standalone masterpiece than an essential structural component of his larger philosophical system.
4. How this Book Engages the Great Conversation
The ancient philosophers often asked what distinguishes humanity from animals or what constitutes the soul. Hobbes reformulates the question:
Can human beings be understood entirely through natural causes?
The pressure behind the book comes from the rise of the new science. If the physical universe operates according to discoverable laws, perhaps the human mind does as well.
The work therefore participates in one of philosophy's oldest debates:
- What is a human being?
- Is thought fundamentally material or immaterial?
- What role does reason actually play in human life?
- Can ethics and politics be built upon a scientific understanding of human nature?
5. Condensed Analysis
What problem is this thinker trying to solve, and what kind of reality must exist for their solution to make sense?
Problem
How do perception, thought, desire, and voluntary action arise?
The question matters because every theory of politics presupposes some theory of human nature. Hobbes assumes that explanations should proceed from observable natural causes rather than metaphysical speculation.
Core Claim
Human mental life is the consequence of bodily processes.
Sensations arise from external motions affecting the senses. Imagination, memory, language, reasoning, and choice develop from these physical operations.
If accepted, psychology becomes part of natural philosophy rather than a separate spiritual science.
Opponent
Hobbes challenges several traditions simultaneously.
- Aristotelian psychology, with its doctrine of substantial forms.
- Scholastic accounts of the soul as the organizing principle of life.
- Cartesian dualism, which separates thinking substance from extended substance.
Critics maintain that consciousness, intentionality, moral awareness, and subjective experience cannot be adequately explained by matter and motion alone.
Breakthrough
Hobbes offers one of the earliest systematic attempts to construct a completely naturalistic psychology.
Instead of beginning with abstract faculties of the soul, he begins with sensation and builds upward toward language, reasoning, and action. This methodological reversal anticipated later developments in psychology, neuroscience, and empirical theories of cognition.
Cost
The explanatory power of Hobbes's system comes at a philosophical price.
If thought is reduced entirely to physical processes, questions concerning consciousness, free will, objective morality, and spiritual experience become difficult to explain. Many readers conclude that his account succeeds as a mechanical model while failing to capture the richness of lived human experience.
One Central Passage
"The original of them all is that which we call Sense; for there is no conception in a man's mind, which hath not at first, totally, or by parts, been begotten upon the organs of Sense."
This sentence summarizes Hobbes's epistemology. Knowledge begins not with innate ideas or abstract reason but with sensory experience. From this foundation he constructs his entire account of human psychology.
6. Fear or Instability as Underlying Motivator
Although De Homine is less overtly political than Leviathan, it shares the same underlying concern: human conduct must be understood realistically rather than idealistically. Hobbes believes mistaken views of human nature inevitably produce unstable political theories.
7. Interpretive Method: Trans-Rational Framework
Hobbes demonstrates extraordinary analytical clarity, yet his reduction of the person to material processes leaves comparatively little room for intuition, aesthetic experience, moral perception, or the interior dimensions of consciousness. Readers adopting a trans-rational framework may appreciate the explanatory strength of his psychology while questioning whether human experience is exhausted by mechanical description.
8. Dramatic & Historical Context
Publication: 1658
Location
Written after Leviathan during Hobbes's mature philosophical period.
Historical Climate
- The Scientific Revolution was transforming conceptions of nature.
- Mechanical explanations increasingly displaced scholastic metaphysics.
- Debates over perception, reason, and the soul intensified across Europe.
De Homine represents Hobbes's contribution to this broader intellectual transformation.
9. Sections Overview
Part I — Human Nature
Examines sensation, imagination, memory, language, and reasoning.
Part II — Motion and Action
Discusses appetite, aversion, voluntary action, liberty, and human conduct.
Later Discussions
Includes reflections upon optics and visual perception, illustrating Hobbes's conviction that psychology and natural science belong together.
10. Targeted Engagement
Not activated.
While historically important, De Homine functions primarily as a supporting volume within Hobbes's larger philosophical architecture. Its principal arguments are sufficiently represented in the abridged analysis.
11. Vital Glossary
- Sense — The origin of all knowledge.
- Imagination — Decaying sensation remaining after perception.
- Memory — Persistent imagination.
- Appetite — Movement toward desired objects.
- Aversion — Movement away from disliked objects.
- Reason — Calculation of consequences.
- Liberty — Absence of external impediments.
- Matter and Motion — Fundamental explanatory principles.
12. Deeper Significance / Strategic Themes
De Homine helped shift philosophy from asking "What is the soul?" toward asking "How does the human organism produce thought and action?"
Although many of Hobbes's conclusions remain controversial, his insistence that political philosophy must rest upon a coherent account of human nature has become a permanent feature of modern philosophy, economics, psychology, and political science.
13. Decision Point
No further textual engagement is necessary for most readers.
This work is valuable chiefly for the conceptual bridge it provides between Hobbes's philosophy of nature and his political theory. Readers seeking Hobbes's most influential ideas should devote greater attention to Leviathan.
14. 'First Day of History' Lens
One of the book's conceptual innovations is its attempt to construct a comprehensive scientific psychology from sensory experience upward. Hobbes treats human thought not as a separate metaphysical realm but as a phenomenon subject to the same explanatory principles governing the physical universe—a significant step in the historical development of naturalistic accounts of mind.
16. Reference Bank of Quotations
- "There is no conception in a man's mind, which hath not at first...been begotten upon the organs of Sense."
- Paraphrase: Every idea begins with sensory experience.
- Commentary: The foundation of Hobbes's empiricist psychology.
- "Reason...is nothing but reckoning."
- Paraphrase: Reason calculates rather than creates values.
- Commentary: A striking reduction of reasoning to computation.
- "Liberty is the absence of external impediments."
- Paraphrase: Freedom means not being physically prevented from acting.
- Commentary: One of Hobbes's most influential definitions of liberty.
17. Core Concept / Mental Anchor
"Understand the human mechanism before constructing the political machine."
18. Famous Words
Unlike Leviathan, De Homine contributed relatively few enduring phrases to popular culture. Its lasting influence lies not in memorable slogans but in several foundational ideas that entered later philosophy:
- Reason as calculation ("reckoning").
- All knowledge begins with sense experience.
- Liberty as the absence of external impediments.
These concepts became important reference points in later debates over empiricism, psychology, free will, and political philosophy.
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