The Categories

Section 2

Part 7

Those things are called relative, which, being either said to be of
something else or related to something else, are explained by reference
to that other thing. For instance, the word ‘superior’ is explained by
reference to something else, for it is superiority over something else
that is meant. Similarly, the expression ‘double’ has this external
reference, for it is the double of something else that is meant. So it
is with everything else of this kind. There are, moreover, other
relatives, e.g. habit, disposition, perception, knowledge, and
attitude. The significance of all these is explained by a reference to
something else and in no other way. Thus, a habit is a habit of
something, knowledge is knowledge of something, attitude is the
attitude of something. So it is with all other relatives that have been
mentioned. Those terms, then, are called relative, the nature of which
is explained by reference to something else, the preposition ‘of’ or
some other preposition being used to indicate the relation. Thus, one
mountain is called great in comparison with another; for the
mountain claims this attribute by comparison with something. Again,
that which is called similar must be similar to something else, and all
other such attributes have this external reference. It is to be noted
that lying and standing and sitting are particular attitudes, but
attitude is itself a relative term. To lie, to stand, to be seated, are
not themselves attitudes, but take their name from the aforesaid
attitudes.

It is possible for relatives to have contraries. Thus virtue has a
contrary, vice, these both being relatives; knowledge, too, has a
contrary, ignorance. But this is not the mark of all relatives;
‘double’ and ‘triple’ have no contrary, nor indeed has any such term.

It also appears that relatives can admit of variation of degree. For
‘like’ and ‘unlike’, ‘equal’ and ‘unequal’, have the modifications
‘more’ and ‘less’ applied to them, and each of these is relative in
character: for the terms ‘like’ and ‘unequal’ bear a
reference to something external. Yet, again, it is not every relative
term that admits of variation of degree. No term such as ‘double’
admits of this modification. All relatives have correlatives: by the
term ‘slave’ we mean the slave of a master, by the term ‘master’, the
master of a slave; by ‘double’, the double of its half; by ‘half’, the
half of its double; by ‘greater’, greater than that which is less; by
‘less’, less than that which is greater.

So it is with every other relative term; but the case we use to express
the correlation differs in some instances. Thus, by knowledge we mean
knowledge of the knowable; by the knowable, that which is to be
apprehended by knowledge; by perception, perception of the perceptible;
by the perceptible, that which is apprehended by perception.

Sometimes, however, reciprocity of correlation does not appear to
exist. This comes about when a blunder is made, and that to which the
relative is related is not accurately stated. If a man states that a
wing is necessarily relative to a bird, the connexion between these two
will not be reciprocal, for it will not be possible to say that a bird
is a bird by reason of its wings. The reason is that the original
statement was inaccurate, for the wing is not said to be relative to
the bird qua bird, since many creatures besides birds have wings, but
qua winged creature. If, then, the statement is made accurate, the
connexion will be reciprocal, for we can speak of a wing, having
reference necessarily to a winged creature, and of a winged creature as
being such because of its wings.

Occasionally, perhaps, it is necessary to coin words, if no word exists
by which a correlation can adequately be explained. If we define a
rudder as necessarily having reference to a boat, our definition will
not be appropriate, for the rudder does not have this reference to a
boat qua boat, as there are boats which have no rudders. Thus we cannot
use the terms reciprocally, for the word ‘boat’ cannot be said to find
its explanation in the word ‘rudder’. As there is no existing word, our
definition would perhaps be more accurate if we coined some word like
‘ruddered’ as the correlative of ‘rudder’. If we express ourselves thus
accurately, at any rate the terms are reciprocally connected, for the
‘ruddered’ thing is ‘ruddered’ in virtue of its rudder. So it is in all
other cases. A head will be more accurately defined as the correlative
of that which is ‘headed’, than as that of an animal, for the animal
does not have a head qua animal, since many animals have no head.

Thus we may perhaps most easily comprehend that to which a thing is
related, when a name does not exist, if, from that which has a name, we
derive a new name, and apply it to that with which the first is
reciprocally connected, as in the aforesaid instances, when we derived
the word ‘winged’ from ‘wing’ and from ‘rudder’.

All relatives, then, if properly defined, have a correlative. I add
this condition because, if that to which they are related is stated as
haphazard and not accurately, the two are not found to be
interdependent. Let me state what I mean more clearly. Even in the case
of acknowledged correlatives, and where names exist for each, there
will be no interdependence if one of the two is denoted, not by that
name which expresses the correlative notion, but by one of irrelevant
significance. The term ‘slave’, if defined as related, not to a master,
but to a man, or a biped, or anything of that sort, is not reciprocally
connected with that in relation to which it is defined, for the
statement is not exact. Further, if one thing is said to be correlative
with another, and the terminology used is correct, then, though all
irrelevant attributes should be removed, and only that one attribute
left in virtue of which it was correctly stated to be correlative with
that other, the stated correlation will still exist. If the correlative
of ‘the slave’ is said to be ‘the master’, then, though all irrelevant
attributes of the said ‘master’, such as ‘biped’, ‘receptive of
knowledge’, ‘human’, should be removed, and the attribute ‘master’
alone left, the stated correlation existing between him and the slave
will remain the same, for it is of a master that a slave is said to be
the slave. On the other hand, if, of two correlatives, one is not
correctly termed, then, when all other attributes are removed and that
alone is left in virtue of which it was stated to be correlative, the
stated correlation will be found to have disappeared.

For suppose the correlative of ‘the slave’ should be said to be ‘the
man’, or the correlative of ‘the wing’ is ‘the bird’; if the attribute
‘master’ be withdrawn from ‘the man’, the correlation between ‘the man’
and ‘the slave’ will cease to exist, for if the man is not a master,
the slave is not a slave. Similarly, if the attribute ‘winged’ be
withdrawn from ‘the bird’, ‘the wing’ will no longer be relative; for
if the so-called correlative is not winged, it follows that ‘the wing’
has no correlative.

Thus it is essential that the correlated terms should be exactly
designated; if there is a name existing, the statement will be easy; if
not, it is doubtless our duty to construct names. When the terminology
is thus correct, it is evident that all correlatives are interdependent.

Correlatives are thought to come into existence simultaneously. This is
for the most part true, as in the case of the double and the half. The
existence of the half necessitates the existence of that of which it is
a half. Similarly the existence of a master necessitates the existence
of a slave, and that of a slave implies that of a master; these are
merely instances of a general rule. Moreover, they cancel one another;
for if there is no double it follows that there is no half, and vice
versa; this rule also applies to all such correlatives. Yet it does not
appear to be true in all cases that correlatives come into existence
simultaneously. The object of knowledge would appear to exist before
knowledge itself, for it is usually the case that we acquire knowledge
of objects already existing; it would be difficult, if not impossible,
to find a branch of knowledge the beginning of the existence of which
was contemporaneous with that of its object.

Again, while the object of knowledge, if it ceases to exist, cancels at
the same time the knowledge which was its correlative, the converse of
this is not true. It is true that if the object of knowledge does not
exist there can be no knowledge: for there will no longer be anything
to know. Yet it is equally true that, if knowledge of a certain object
does not exist, the object may nevertheless quite well exist. Thus, in
the case of the squaring of the circle, if indeed that process is an
object of knowledge, though it itself exists as an object of knowledge,
yet the knowledge of it has not yet come into existence. Again, if all
animals ceased to exist, there would be no knowledge, but there might
yet be many objects of knowledge.

This is likewise the case with regard to perception: for the object of
perception is, it appears, prior to the act of perception. If the
perceptible is annihilated, perception also will cease to exist; but
the annihilation of perception does not cancel the existence of the
perceptible. For perception implies a body perceived and a body in
which perception takes place. Now if that which is perceptible is
annihilated, it follows that the body is annihilated, for the body is a
perceptible thing; and if the body does not exist, it follows that
perception also ceases to exist. Thus the annihilation of the
perceptible involves that of perception.

But the annihilation of perception does not involve that of the
perceptible. For if the animal is annihilated, it follows that
perception also is annihilated, but perceptibles such as body, heat,
sweetness, bitterness, and so on, will remain.

Again, perception is generated at the same time as the perceiving
subject, for it comes into existence at the same time as the animal.
But the perceptible surely exists before perception; for fire and water
and such elements, out of which the animal is itself composed, exist
before the animal is an animal at all, and before perception. Thus it
would seem that the perceptible exists before perception.

It may be questioned whether it is true that no substance is relative,
as seems to be the case, or whether exception is to be made in the case
of certain secondary substances. With regard to primary substances, it
is quite true that there is no such possibility, for neither wholes nor
parts of primary substances are relative. The individual man or ox is
not defined with reference to something external. Similarly with the
parts: a particular hand or head is not defined as a particular hand or
head of a particular person, but as the hand or head of a particular
person. It is true also, for the most part at least, in the case of
secondary substances; the species ‘man’ and the species ‘ox’ are not
defined with reference to anything outside themselves. Wood, again, is
only relative in so far as it is some one’s property, not in so far as
it is wood. It is plain, then, that in the cases mentioned substance is
not relative. But with regard to some secondary substances there is a
difference of opinion; thus, such terms as ‘head’ and ‘hand’ are
defined with reference to that of which the things indicated are a
part, and so it comes about that these appear to have a relative
character. Indeed, if our definition of that which is relative was
complete, it is very difficult, if not impossible, to prove that no
substance is relative. If, however, our definition was not complete, if
those things only are properly called relative in the case of which
relation to an external object is a necessary condition of existence,
perhaps some explanation of the dilemma may be found.

The former definition does indeed apply to all relatives, but the fact
that a thing is explained with reference to something else does not
make it essentially relative.

From this it is plain that, if a man definitely apprehends a relative
thing, he will also definitely apprehend that to which it is relative.
Indeed this is self-evident: for if a man knows that some particular
thing is relative, assuming that we call that a relative in the case of
which relation to something is a necessary condition of existence, he
knows that also to which it is related. For if he does not know at all
that to which it is related, he will not know whether or not it is
relative. This is clear, moreover, in particular instances. If a man
knows definitely that such and such a thing is ‘double’, he will also
forthwith know definitely that of which it is the double. For if there
is nothing definite of which he knows it to be the double, he does not
know at all that it is double. Again, if he knows that a thing is more
beautiful, it follows necessarily that he will forthwith definitely
know that also than which it is more beautiful. He will not merely know
indefinitely that it is more beautiful than something which is less
beautiful, for this would be supposition, not knowledge. For if he does
not know definitely that than which it is more beautiful, he can no
longer claim to know definitely that it is more beautiful than
something else which is less beautiful: for it might be that nothing
was less beautiful. It is, therefore, evident that if a man apprehends
some relative thing definitely, he necessarily knows that also
definitely to which it is related.

Now the head, the hand, and such things are substances, and it is
possible to know their essential character definitely, but it does not
necessarily follow that we should know that to which they are related.
It is not possible to know forthwith whose head or hand is meant. Thus
these are not relatives, and, this being the case, it would be true to
say that no substance is relative in character. It is perhaps a
difficult matter, in such cases, to make a positive statement without
more exhaustive examination, but to have raised questions with regard
to details is not without advantage.