Highest Genera and the Ten Categories

1. From highest genus to the ten categories

The previous level defined a highest genus as one above which no further genus stands. This raises a question: is substance alone the highest genus of everything, or are there other highest genera?

فصل: الأجناس العالية عشرة، وليس في العالم شيء خارجا عن هذه الأجناس.
The highest genera are ten; within this classification, nothing in the world lies outside them.

These are the ten categories (maqūlāt ‘asharah). In the classical logical and philosophical framework, they classify beings and their attributes. They also clarify how a genus differs from an accident.

2. Names of the ten categories

The ten classical categories are:
1. Substance (jawhar) — something existing in itself.
2. Quantity (kamm) — magnitude or number.
3. Quality (kayf) — what something is like.
4. Relation (iḍāfah) — relation to another.
5. Place (ayn) — relation to location.
6. Having (milk) — an enveloping condition.
7. Action (fi‘l) — progressively causing an effect.
8. Passion (infi‘āl) — progressively receiving an effect.
9. Time (matā) — relation to time.
10. Position (waḍ‘) — arrangement of parts.

Substance is one category; the other nine are accidental categories. Each example is classified with respect to the relevant aspect.

3. Source definition of substance

والجوهر: هو الموجود لا في موضوع، أي محل، بل قائم بنفسه كالأجسام.
A substance is an existent that is not in a subject or bearer; rather, it subsists in itself, as bodies do.

Here subject (mawḍū‘) means a bearer in which an attribute inheres. A table is a body; its length and color are found in it. The body is the example of substance, while its length and color are attributes.

Calling substance self-subsistent does not mean that it needs no cause. It means that it does not inhere in a bearer as an accident does.

4. Accident versus substance

والعرض: هو الموجود في موضوع، أي محل.
An accident is an existent in a subject or bearer.

Consider a white sheet of paper. The paper is a body, while its whiteness is a quality. Whiteness is an attribute of the paper, and the paper is its bearer.

The distinction appears when we ask “What thing is it?” versus “What attribute does it have?”. Accidents are not restricted to colors: the nine categories also include quantity, place, time, relation and forms of activity.

5. A bearer is not a proposition subject

The word subject has different uses in logic. In “Zayd is learned,” Zayd is the subject of a proposition: the assertion is about him.

In “Whiteness inheres in cloth,” the cloth is the bearer of the accident. In the definition of the categories, “in a subject” refers to this second meaning, not to every noun that could serve as the subject of a sentence.

Without this distinction, one might incorrectly say that paper must be an accident because “paper” is the subject of “paper is white.” The paper is the body; whiteness is the accident.

6. Quantity: magnitude and number

Quantity (kamm) is the accidental category concerned with magnitude or count. Length, spatial extension and the number of items in a collection are examples.

A stick is two yards long — the stick is the body, while its length falls under quantity.
Five books are on a table — the count of the books illustrates quantity.

Neither the stick nor the books are simply quantity in their entire reality. The relevant aspect being classified is their magnitude or number.

7. Continuous and discrete quantity

The notes divide quantity into continuous and discrete. A continuous magnitude has parts with a conceivable common boundary; a discrete quantity is a count or number.

Continuous quantity: a line, a surface or bodily volume, which exhibit extension.
Discrete quantity: number, such as a count of 2, 3 or 10 individuals.

A row of three books is a discrete quantity insofar as it is counted, even if the books touch. The objects themselves should not be confused with the aspect of quantity.

8. Recognizing quality

والكيف: وهو عرض لا يقتضي القسمة والنسبة، وأقسامه أربعة:
Quality is an accident that does not entail division as quantity does or relation as relationality does; it has four divisions.

Whiteness is a quality of paper; hardness is a quality of stone; knowledge is classed as a quality of a person. These do not directly state length or count.

Quality is not limited to visible color. In this traditional classification, dispositions, mental states and sensible characteristics can also fall under quality.

9. Four groups of quality

The commentary gives four groups of quality:
1. Sensible qualities — such as heat, cold and color.
2. Psychic qualities — such as knowledge and traits of character.
3. Qualities associated with quantities — such as forms or shapes.
4. Dispositional qualities — capacities to receive or resist an effect.

All concern what something is like. A quality may still be measured numerically; that use of numbers does not automatically turn the quality itself into the category of quantity.

10. Distinguish quantity from quality

One object can be considered from different angles:
How long is the table? — “Four feet,” an instance of quantity.
What is the table like? — “Black” or “smooth,” instances of quality.

Similarly, three glasses of water concern number, while the warmth of water concerns sensible quality.

The word “more” does not always indicate quantity as a category. “Warmer” compares degrees of a quality; we must identify the actual attribute under discussion.

11. Relation as a category

والإضافة: هي عبارة عن النسبة المكررة.
Relation is a repeated or reciprocal reference: when a relation is considered from one side, a corresponding relation can be conceived from the other.

Father is understood relative to a child, and child relative to a parent. Teacher and student can likewise illustrate relation.

The point is not that two things merely occupy one place. Rather, each is understood by reference to the other within the relevant relational description.

12. Both ends of a relation

Suppose Zayd is Amr’s father. Two descriptions arise:
Zayd → father of Amr
Amr → son of Zayd

Different expressions describe the same relationship from opposite ends, illustrating relation.

By contrast, “Zayd is white” states a quality, not a reciprocal relation like father and son. The mere grammatical presence of “of” or “to” does not always prove that the philosophical category of relation is being used.

13. Where: relation to place

والأين: هي نسبة المتمكن إلى المكان.
Place is the relation of a located thing to its location.

Zayd is in the house — this identifies his relation to a place.
The bird is on a tree — this gives its location relative to the tree.

Ayn answers “Where?”. Saying where Zayd is does not change his essence, length or color; it describes his spatial relation.

14. Having: an enveloping condition

والملك: هو هيئة تعرض الجسم بسبب ما يلاقيه، ويشتمل عليه، وينتقل بانتقاله.
Having is a condition arising in a body from something that touches and envelops it and moves with it.

For example, a person wearing clothes: the clothing surrounds the body and accompanies its movement. Classical categories call this kind of condition milk.

The term does not mean legal ownership in general. Owning a piece of land and having a cloak wrapped around one's body are different notions.

15. Action: progressively causing an effect

والفعل: هو إخراج شيء من القوة إلى الفعل يسيرا يسيرا كالتبريد والتسخين.
Action is progressively bringing something from potentiality to actuality, as in cooling or heating.

For instance, fire heats the water in a vessel. The analysis concerns the causing of an effect; in this respect, heating (taskhīn) exemplifies action.

Fi‘l here does not mean every grammatical verb in Arabic. A word may be a verb in syntax, while action in the categories has its own philosophical criterion.

16. Passion: progressively receiving an effect

والانفعال: هو خروج الشيء من القوة إلى الفعل على سبيل التدريج.
Passion is a thing's gradual passage from potentiality to actuality: undergoing an effect and changing state.

Water in a vessel becomes heated by the fire. The water is undergoing the effect, so this is an illustration of infi‘āl.

In ordinary language, acting and being affected can mean many things. Here action and passion are opposite aspects of the same progressive change.

17. Action and passion: two sides of one event

A pot of cold water is heated over a fire.

Fire heats the water — the side producing the effect: action.
The water gradually becomes hot — the side undergoing the effect: passion.

Both descriptions concern one process from different sides. By contrast, “the water is hot” can merely report the existing quality of heat, without indicating a progressive change.

Distinguish heating, being heated, and possessing heat.

18. When: relation to time

والمتى: هو نسبة الشيء إلى الزمان.
Time is the relation of a thing or event to time.

The meeting took place in the morning — the event is related to a time.
The traveler arrived yesterday — a time is assigned to the arrival.

Ayn answers “Where?” and matā answers “When?”. The same event may happen “in the mosque” and “on Friday,” but the first is a spatial relation and the second temporal.

19. Time relation versus measurable duration

Matā concerns when an event occurs. “The lesson took place on Monday” relates it to a time.

“The lesson lasted 40 minutes” additionally concerns a measurable duration. That involves an aspect of quantity. We should not place every expression containing a number exclusively into the category of time.

One event may have multiple descriptions:
Where? At school — place.
When? On Monday — time.
How long? Forty minutes — measured duration.

20. Position: arrangement of parts

Position (waḍ‘) is a configuration arising from how the parts of a body are arranged relative to each other and to their surroundings. Sitting, standing and lying down illustrate it.

A seated person: head, torso and feet have a particular arrangement.
A standing person: the same body and parts are arranged differently.

Position is not the same as place. Two people may occupy the same room while one stands and the other sits: same location, different position.

21. Position versus shape

When a person stands and then sits, their position changes. That does not require a change in the body's permanent dimensions or color.

Triangularity is a shape, discussed among qualities; sitting on a chair is a position arising from the arrangement of bodily parts.

Both may be called forms or configurations in ordinary speech, but their defining features and relevant relations are not identical.

22. Having, relation and position distinguished

Consider three claims about one person:
He is Amr’s father — a reciprocal familial relation.
He is sitting — an arrangement of bodily parts, or position.
He wears a cloak — an enveloping condition, or having.

The same person is described throughout, but each statement identifies a different aspect. Classification concerns what kind of attribute is predicated, not merely who the grammatical subject is.

23. One object, several categories

Consider these nine descriptions of a person:
He is six feet tall — quantity.
His garment is white — the garment's color is quality.
He is Zayd's brother — relation.
He is in a room — place.
He arrived that morning — time.
He is seated on a chair — position.
He is wrapped in a cloak — having.
He is heating water — action.
His hand is being warmed — passion.

The person's body is the example of substance; the other descriptions concern different accidental aspects.

24. One situation, multiple analytical angles

“Zayd is seated in the library today, drinking hot tea” describes one situation but offers several pieces of information.

Zayd — a bodily individual, illustrating substance.
Today — relation to time.
In the library — relation to place.
Seated — position.
The heat of the tea — quality.

The aim is not to force each word into a separate category. It is to identify which category fits the relevant attribute or relation.

25. Ten categories versus five predicables

The five predicables — genus, species, differentia, property and common accident — explain how a universal relates to the essences or attributes of its instances.

The ten categories — substance and nine accidental categories — sort things and attributes by their most basic kind of being within the classical scheme.

For example, whiteness falls under quality among the categories; “white,” said of a human, is non-essential and belongs to common accident among the five predicables, since whiteness can occur in other species too.

The same item may be analyzed in both ways, provided we keep the questions of the two classifications distinct.

26. What makes a highest genus highest?

Substance, quantity, quality and the other categories are called highest genera because classical classification does not posit a further shared real genus above them.

Body and its subdivisions fall under substance. Sensible, psychic and other kinds of quality fall under quality.

The term “existent” may apply to all ten, but in this system it is not treated as a single common real genus above them. A word's applicability to many things does not by itself make it a genus.

27. Scope and limits of the classification

This classification belongs to the established discourse of classical logic and philosophy. Each category gives a way to ask what kind of attribute is under consideration. It should not automatically be taken as a substitute for every classification in modern natural sciences.

The source notes mention further subdivisions of quantity and quality, leaving detailed treatment of some branches to their specialist disciplines. The goal here is to define, recognize and distinguish the ten categories.

Keeping substance apart from accident, place from position, quantity from quality, and action from passion prepares the learner for later logical analysis.

28. Consolidation and transition

Substance: not inhering in a bearer as an accident does.
Quantity: magnitude or number.
Quality: a sensible or other kind of quality.
Relation: reciprocal reference.
Place: where something is.
Having: a condition from an enveloping item.
Action: producing an effect.
Passion: receiving an effect.
Time: when it is.
Position: arrangement of parts.

Beyond memorizing names, learners must identify the bearer and the specific attribute in an example. The book then turns to the ordering of species and their higher and lower levels.