Summary
Summary of On the Soul
Key ideas
Key idea 1
The soul explains being alive
What makes a living thing different from a dead one? Aristotle begins with that question, rather than with the idea of a ghost hidden inside a body. A plant has a soul in his sense, just as a dog or a human being does.
The task is to understand this principle of life through the powers it gives. Nutrition, growth, sensation, imagination, thought and desire belong to the same inquiry. Asking about the soul means asking how these activities fit together in a living creature.
Key idea 2
Soul and body belong together
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Key idea 3
Living powers build on one another
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Key idea 4
Perception receives form without matter
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Key idea 5
One perceptive power joins the senses
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Key idea 6
Imagination carries perception into thought
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Key idea 7
Intellect raises a question about separation
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Key idea 8
Desire gives animals a reason to move
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Key idea 9
Life is understood through connected powers
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Read the rest freeWho it’s for
For readers who love exploring the origins of Western ideas about mind, life and perception, and for students of philosophy or psychology.
What this book is
On the Soul is Aristotle's study of what it means to be alive. The Greek title is Peri Psyches, and it is better known by its Latin name, De Anima. Aristotle wrote it in the fourth century BC, most likely during his years teaching at the Lyceum in Athens. It is one of the works in which he treats living nature as a subject for careful inquiry, alongside his books on animals and on the senses.
By soul, Aristotle does not mean a ghost inside a body. He means whatever makes a living thing different from a dead one. On that view a plant has a soul, a dog has a soul, and so do you. The book asks what this principle of life is, what powers it gives, and how those powers are connected. It moves from nutrition and growth, through the five senses, to imagination, thought and the desires that set animals in motion.
You will get a clear map of the three books and the main claims in each. You will meet the famous images, such as the wax that takes the shape of a ring and the axe that has lost its power to cut. You will also see why readers have argued over a few short lines about the intellect for more than two thousand years. Let us start with the question of how to study the soul at all.
In this summary
- 1The soul must be studied as natureFree
- 2The soul is the form of the body
- 3Living things differ by their powers
- 4Perception takes in form without matter
- 5Each sense has its own objects
- 6A common sense binds the senses together
- 7Imagination lies between sense and thought
- 8The intellect receives forms and may stand apart
- 9Desire moves animals and the book still lasts
Key point 1 of 9
The soul must be studied as nature
Aristotle opens Book One by saying that the study of the soul is among the most valuable kinds of knowledge. It is hard too, because it is not clear what method to use or what sort of thing the soul is. Is it a substance, a quality, or an amount? Is it one thing with parts, or many things? He wants to answer these questions before going further.
He also insists that the soul belongs to the study of nature. Most states of the soul, such as anger, courage, appetite and sensation, seem to involve the body. A man is angry, Aristotle says, when the blood boils around his heart, and he can be angry in one account because he wants revenge. The student of nature and the philosopher describe the same event in two ways, one by its matter and one by its form. A full account needs both.
Then Aristotle reviews what earlier thinkers had said. Some, like Democritus, made the soul out of fine round atoms that are always in motion. Others said it was a kind of fire, or air, or a blend of all the elements so that like could know like. Aristotle notes that almost everyone defines the soul by two marks, movement and perception, and then picks material that seems to suit them.
He takes the rival views one at a time and finds them lacking. The Pythagorean tale that any soul can enter any body fails, he argues, because each kind of body has its own sort of soul. The idea of the soul as a self-moving number makes little sense of how a number could move. He also rejects the view that the soul is a harmony of the body, because a harmony cannot rule the very parts it arises from, while the soul often resists the body's pull.
What do you take from this opening? Aristotle shows a habit that runs through all his work. He begins with what people before him believed, sorts out where they were right, and builds his own account from the wreckage. His complaint is that earlier thinkers explained what the soul is made of but never what it is for or how it fits its body. That gap is what the next part sets out to fill.
That’s 1 of 9 key points.
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Check yourself
How does Aristotle understand the relation between soul and body?
Right. “A living body, he argues, is matter, and the soul is its form.”Not quite. “A living body, he argues, is matter, and the soul is its form.”
Why does imagination matter for human thought?
Right. “Aristotle says the thinking soul never thinks without an image.”Not quite. “Aristotle says the thinking soul never thinks without an image.”
What moves an animal, according to Aristotle?
Right. “What moves an animal is desire, working together with either imagination or thought, which presents something as worth going for.”Not quite. “What moves an animal is desire, working together with either imagination or thought, which presents something as worth going for.”
Questions about On the Soul
What is Aristotle's On the Soul about?
It asks what life is. Aristotle defines the soul as the form of a living body, then studies its powers in turn: nutrition, perception, imagination, thought and the desire that moves animals.
What does Aristotle mean by soul?
Not a ghost or a separate spirit. For Aristotle, soul is whatever makes a body alive, its organized capacities to feed, sense, move or think. Plants and animals have souls too, of simpler kinds.
What is De Anima and why is it called that?
De Anima is the Latin title of Aristotle's Greek work Peri Psyches. Anima means soul in Latin. Medieval scholars used the Latin name, and it is still the usual title in academic writing.
Is On the Soul hard to read?
No. The book moves in a clear order, from feeding and growth through the five senses to imagination and thought. Plain examples like wax taking the shape of a ring and an axe that can cut make each idea easy to picture.
What is the active intellect in Aristotle?
It is a short, much discussed idea in Book Three. Aristotle describes a maker intellect, like light, that makes understanding possible. Ancient, Islamic and medieval thinkers read it in very different ways.
