An Enquiry Concerning Human Understanding - David Hume (free ereaders .txt) 📗
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nothing can be more curious, as well as useful, than to trace, by a
variety of mediums, their equality or inequality, through their
different appearances. But as all other ideas are clearly distinct and
different from each other, we can never advance farther, by our utmost
scrutiny, than to observe this diversity, and, by an obvious reflection,
pronounce one thing not to be another. Or if there be any difficulty in
these decisions, it proceeds entirely from the undeterminate meaning of
words, which is corrected by juster definitions. That _the square of the
hypothenuse is equal to the squares of the other two sides_, cannot be
known, let the terms be ever so exactly defined, without a train of
reasoning and enquiry. But to convince us of this proposition, _that
where there is no property, there can be no injustice_, it is only
necessary to define the terms, and explain injustice to be a violation
of property. This proposition is, indeed, nothing but a more imperfect
definition. It is the same case with all those pretended syllogistical
reasonings, which may be found in every other branch of learning, except
the sciences of quantity and number; and these may safely, I think, be
pronounced the only proper objects of knowledge and demonstration.
132. All other enquiries of men regard only matter of fact and
existence; and these are evidently incapable of demonstration. Whatever
is may not be. No negation of a fact can involve a contradiction.
The non-existence of any being, without exception, is as clear and
distinct an idea as its existence. The proposition, which affirms it not
to be, however false, is no less conceivable and intelligible, than that
which affirms it to be. The case is different with the sciences,
properly so called. Every proposition, which is not true, is there
confused and unintelligible. That the cube root of 64 is equal to the
half of 10, is a false proposition, and can never be distinctly
conceived. But that Caesar, or the angel Gabriel, or any being never
existed, may be a false proposition, but still is perfectly conceivable,
and implies no contradiction.
The existence, therefore, of any being can only be proved by arguments
from its cause or its effect; and these arguments are founded entirely
on experience. If we reason a priori, anything may appear able to
produce anything. The falling of a pebble may, for aught we know,
extinguish the sun; or the wish of a man control the planets in their
orbits. It is only experience, which teaches us the nature and bounds of
cause and effect, and enables us to infer the existence of one object
from that of another[34]. Such is the foundation of moral reasoning,
which forms the greater part of human knowledge, and is the source of
all human action and behaviour.
[34] That impious maxim of the ancient philosopher, _Ex nihilo,
nihil fit_, by which the creation of matter was excluded,
ceases to be a maxim, according to this philosophy. Not all the
will of the supreme Being may create matter; but, for aught we
know a priori, the will of any other being might create it,
or any other cause, that the most whimsical imagination
can assign.
Moral reasonings are either concerning particular or general facts. All
deliberations in life regard the former; as also all disquisitions in
history, chronology, geography, and astronomy.
The sciences, which treat of general facts, are politics, natural
philosophy, physic, chemistry, &c. where the qualities, causes and
effects of a whole species of objects are enquired into.
Divinity or Theology, as it proves the existence of a Deity, and the
immortality of souls, is composed partly of reasonings concerning
particular, partly concerning general facts. It has a foundation in
reason, so far as it is supported by experience. But its best and most
solid foundation is faith and divine revelation.
Morals and criticism are not so properly objects of the understanding as
of taste and sentiment. Beauty, whether moral or natural, is felt, more
properly than perceived. Or if we reason concerning it, and endeavour to
fix its standard, we regard a new fact, to wit, the general tastes of
mankind, or some such fact, which may be the object of reasoning
and enquiry.
When we run over libraries, persuaded of these principles, what havoc
must we make? If we take in our hand any volume; of divinity or school
metaphysics, for instance; let us ask, _Does it contain any abstract
reasoning concerning quantity or number?_ No. _Does it contain any
experimental reasoning concerning matter of fact and existence?_ No.
Commit it then to the flames: for it can contain nothing but sophistry
and illusion.
INDEX
Abstraction
not source of ideas of primary qualities, 122.
Academic
philosophy, 34.
Action
and philosophy, 1, 4, 34, 128;
Addition
4.Analogy
a species of, the foundation of all reasoning about matter of fact,
82;
Animals
the reason of, 83-85;
learn from experience and draw inferences, 83;
which can only be founded on custom, 84;
cause of difference between men and animals, 84 n.
Antiquity
62.Appearances
to senses must be corrected by reason, 117.
A priori
25, 36 n, 89 n, 132, 132 n.
Aristotle
4.Association
of ideas, three principles of, 18-19, 41-44 (v. Cause C).
Atheism
116.Bacon
99.Belief
(v. Cause C, 39-45);
and chance, 46.
Berkeley
really a sceptic, 122 n.
Bigotry
102.Body
and soul, mystery of union of, 52;
volition and movements of, 52.
Real existence of (v. Scepticism, B, 118-123).
Cause
first (v. God, Necessity, 78-81; Providence,
102-115, 132 n).
a principle of association of ideas, 19, 43;
sole foundation of reasonings about matter of fact or real existence,
22.A. Knowledge of Causes arises from experience not from Reason,
23-33.
Reasonings a priori give no knowledge of cause and effect,
23 f.;
impossible to see the effect in the cause since they are totally
different, 25;
natural philosophy never pretends to assign ultimate causes, but only
to reduce causes to a few general causes, e.g. gravity, 26;
geometry applies laws obtained by experience, 27.
Conclusions from experience not based on any process of the
understanding, 28;
yet we infer in the future a similar connexion between known
qualities of things and their secret powers, to that which
we assumed in the past. On what is this inference based? 29;
demonstrative reasoning has no place here, and all experimental
reasoning assumes the resemblance of the future to the past,
and so cannot prove it without being circular, 30, 32;
if reasoning were the basis of this belief, there would be no need
for the multiplication of instances or of long experience,
31;
yet conclusions about matter of fact are affected by experience even
in beasts and children, so that they cannot be founded on
abstruse reasoning, 33;
to explain our inferences from experience a principle is required of
equal weight and authority with reason, 34.
B. _Custom enables us to infer existence of one object from the
appearance of another_, 35-38.
Experience enables us to ascribe a more than arbitrary connexion to
objects, 35;
we are determined to this by custom or habit which is the great guide
of human life, 36;
but our inference must be based on some fact present to the senses
or memory, 37;
the customary conjunction between such an object and some other
object produces an operation of the soul which is as
unavoidable as love, 38;
animals also infer one event from another by custom, 82-84;
and in man as in animals experimental reasoning depends on a species
of instinct or mechanical power that acts in us unknown to
ourselves, 85.
C. Belief, 39-45.
Belief differs from fiction or the loose reveries of the fancy by
some feeling annexed to it, 39;
belief cannot be defined, but may be described as a more lively,
forcible, firm, steady conception of an object than can be
attained by the imagination alone, 40;
it is produced by the principles of association, viz. resemblance,
41;
contiguity, 42;
causation, 43;
by a kind of pre-established harmony between the course of nature
and our ideas, 44;
this operation of our minds necessary to our subsistence and so
entrusted by nature to instinct rather than to reasoning, 45.
Probability, 46-7.
Belief produced by a majority of chances by an inexplicable
contrivance of Nature, 46 (cf. 87-8);
probability of causes: the failure of a cause ascribed to a secret
counteracting cause, 47 (cf. 67);
it is universally allowed that chance when strictly examined is a
mere negative word, 74.
D. Power, 49-57.
Power, force, energy, necessary connexion must either be defined by
analysis or explained by production of the impression from
which they are copied, 49;
from the first appearance of an object we cannot foretell its effect:
we cannot see the power of a single body: we only see
sequence, 50.
Is the idea of power derived from an internal impression and is it an
idea of reflection? 51;
it is not derived, as Locke said, from reasoning about power of
production in nature, 50 n;
nor from consciousness of influence of will over bodily organs, 52;
nor from effort to overcome resistance, 52 n (cf. 60 n);
nor from influence of will over mind, 53;
many philosophers appeal to an invisible intelligent principle, to a
volition of the supreme being, and regard causes as only
occasions and our mental conceptions as revelations, 54-5;
thus diminishing the grandeur of God, 56;
this theory too bold and beyond verification by our faculties, and
is no explanation, 57;
vis inertiae, 57 n.
In single instances we only see sequence of loose events which are
conjoined and never connected, 58;
the idea of necessary connexion only arises from a number of similar
instances, and the only difference between such a number and
a single instance is that the former produces a habit of
expecting the usual attendant, 59, 61.
This customary transition is the impression from which we form the
idea of necessary connexion.
E. Reasoning from effect to cause and conversely, 105-115 (v.
Providence).
In arguing from effect to cause we must not infer more qualities in
the cause than are required to produce the effect, nor reason
backwards from an inferred cause to new effects, 105-8;
we can reason back from cause to new effects in the case of human
acts by analogy which rests on previous knowledge, 111-2;
when the effect is entirely singular and does not belong to any
species we cannot infer its cause at all, 115.
F. Definitions of Cause, 60 (cf. 74 n).
Ceremonies
41.Chance
ignorance of causes, 46;
has no existence, 74 (v. Cause B).
Cicero
4.Circle
in reasoning, 30.
Clarke
37 n.
Colour
peculiarity of ideas of, 16.
Contiguity
19, 42.
Contradiction
the test of demonstration, 132.
Contrariety
19 n.
Contrary
of matter of fact always possible, 21, 132.
Creation
132 n.
Criticism
132.Cudworth
57 n, 158 n.
Custom
when strongest conceals itself, 24;
an ultimate principle of all conclusions from experience, 36, 127;
and belief, 39-45;
gives rise to inferences of animals, 84.
Definition
only applicable to complex ideas, 49;
need of, 131;
of cause, 60.
Demonstrative
opp. intuitive, 20;
reasoning, 30;
confined to quantity and number, 131;
impossible to demonstrate a fact since no negation of a fact can
involve a contradiction, 132.
Descartes
57 n.;
his universal doubt antecedent to study if strictly taken is
incurable, since even from an indubitable first
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