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Speculations on Metaphysics


It is an axiom in mental philosophy, that we can think of nothing
which we have not perceived. When I say that we can think of nothing,
I mean, we can imagine nothing, we can reason of nothing, we can
remember nothing, we can foresee nothing. The most astonishing
combinations of poetry, the subtlest deductions of logic and
mathematics, are no other than combinations which the intellect
makes of sensations according to its own laws. A catalogue of all
the thoughts of the mind, and of all their possible modifications,
is a cyclopedic history of the universe.

But, it will be objected, the inhabitants of the various planets of
this and other solar systems; and the existence of a Power bearing
the same relation to all that we perceive and are, as what we
call a cause does to what we call effect, were never subjects of
sensation, and yet the laws of mind almost universally suggest,
according to the various disposition of each, a conjecture,
a persuasion, or a conviction of their existence. The reply is
simple; these thoughts are also to be included in the catalogue
of existence; they are modes in which thoughts are combined; the
objection only adds force to the conclusion, that beyond the limits
of perception and thought nothing can exist.

Thoughts, or ideas, or notions, call them what you will, differ
from each other, not in kind, but in force. It has commonly been
supposed that those distinct thoughts which affect a number of
persons, at regular intervals, during the passage of a multitude
of other thoughts, which are called REAL or EXTERNAL OBJECTS,
are totally different in kind from those which affect only a few
persons, and which recur at irregular intervals, and are usually
more obscure and indistinct, such as hallucinations, dreams, and the
ideas of madness. No essential distinction between any one of these
ideas, or any class of them, is founded on a correct observation of
the nature of things, but merely on a consideration of what thoughts
are most invariably subservient to the security and happiness of
life; and if nothing more were expressed by the distinction, the
philosopher might safely accommodate his language to that of the
vulgar. But they pretend to assert an essential difference, which
has no foundation in truth, and which suggests a narrow and false
conception of universal nature, the parent of the most fatal errors
in speculation. A specific difference between every thought of the
mind, is, indeed, a necessary consequence of that law by which it
perceives diversity and number; but a generic and essential difference
is wholly arbitrary. The principle of the agreement and similarity
of all thoughts, is, that they are all thoughts; the principle
of their disagreement consists in the variety and irregularity of
the occasions on which they arise in the mind. That in which they
agree, to that in which they differ, is as everything to nothing.
Important distinctions, of various degrees of force, indeed, are to
be established between them, if they were, as they may be, subjects
of ethical and economical discussion; but that is a question
altogether distinct. By considering all knowledge as bounded by
perception, whose operations may be indefinitely combined, we arrive
at a conception of Nature inexpressibly more magnificent, simple
and true, than accords with the ordinary systems of complicated and
partial consideration. Nor does a contemplation of the universe,
in this comprehensive and synthetical view, exclude the subtlest
analysis of its modifications and parts.

A scale might be formed, graduated according to the degrees
of a combined ratio of intensity, duration, connexion, periods of
recurrence, and utility, which would be the standard, according to
which all ideas might be measured, and an uninterrupted chain of
nicely shadowed distinctions would be observed, from the faintest
impression on the senses, to the most distinct combination of those
impressions; from the simplest of those combinations, to that mass
of knowledge which, including our own nature, constitutes what we
call the universe.

We are intuitively conscious of our own existence, and of that
connexion in the train of our successive ideas, which we term our
identity. We are conscious also of the existence of other minds;
but not intuitively. Our evidence, with respect to the existence of
other minds, is founded upon a very complicated relation of ideas,
which it is foreign to the purpose of this treatise to anatomize.
The basis of this relation is, undoubtedly, a periodical recurrence
of masses of ideas, which our voluntary determinations have, in
one peculiar direction, no power to circumscribe or to arrest, and
against the recurrence of which they can only imperfectly provide.
The irresistible laws of thought constrain us to believe that the
precise limits of our actual ideas are not the actual limits of
possible ideas; the law, according to which these deductions are
drawn, is called analogy; and this is the foundation of all our
inferences, from one idea to another, inasmuch as they resemble
each other.

We see trees, houses, fields, living beings in our own shape, and
in shapes more or less analogous to our own. These are perpetually
changing the mode of their existence relatively to us. To express
the varieties of these modes, we say, WE MOVE, THEY MOVE; and as this
motion is continual, though not uniform, we express our conception
of the diversities of its course by--IT HAS BEEN, IT IS, IT SHALL
BE. These diversities are events or objects, and are essential,
considered relatively to human identity, for the existence of the
human mind. For if the inequalities, produced by what has been
termed the operations of the external universe, were levelled by the
perception of our being, uniting and filling up their interstices,
motion and mensuration, and time, and space; the elements of the
human mind being thus abstracted, sensation and imagination cease.
Mind cannot be considered pure.


We do not attend sufficiently to what passes within ourselves. We
combine words, combined a thousand times before. In our minds we
assume entire opinions; and in the expression of those opinions,
entire phrases, when we would philosophize. Our whole style of
expression and sentiment is infected with the tritest plagiarisms.
Our words are dead, our thoughts are cold and borrowed.

Let us contemplate facts; let us, in the great study of ourselves,
resolutely compel the mind to a rigid consideration of itself. We
are not content with conjecture, and inductions, and syllogisms,
in sciences regarding external objects. As in these, let us also,
in considering the phenomena of mind, severely collect those
facts which cannot be disputed. Metaphysics will thus possess this
conspicuous advantage over every other science, that each student,
by attentively referring to his own mind, may ascertain the
authorities upon which any assertions regarding it are supported.
There can thus be no deception, we ourselves being the depositaries
of the evidence of the subject which we consider.

Metaphysics may be defined as an inquiry concerning those things
belonging to, or connected with, the internal nature of man.

It is said that mind produces motion; and it might as well have
been said, that motion produces mind.


If it were possible that a person should give a faithful history of
his being, from the earliest epochs of his recollection, a picture
would be presented such as the world has never contemplated before.
A mirror would be held up to all men in which they might behold
their own recollections, and, in dim perspective, their shadowy hopes
and fears,--all that they dare not, or that, daring and desiring,
they could not expose to the open eyes of day. But thought can
with difficulty visit the intricate and winding chambers which it
inhabits. It is like a river whose rapid and perpetual stream flows
outwards;--like one in dread who speeds through the recesses of
some haunted pile, and dares not look behind. The caverns of the
mind are obscure, and shadowy; or pervaded with a lustre, beautifully
bright indeed, but shining not beyond their portals. If it were
possible to be where we have been, vitally and indeed--if, at the
moment of our presence there, we could define the results of our
experience,--if the passage from sensation to reflection--from a
state of passive perception to voluntary contemplation, were not
so dizzying and so tumultuous, this attempt would be less difficult.


Most of the errors of philosophers have arisen from considering
the human being in a point of view too detailed and circumscribed
He is not a moral, and an intellectual,--but also, and pre-eminently,
an imaginative being. His own mind is his law; his own mind is all
things to him. If we would arrive at any knowledge which should be
serviceable from the practical conclusions to which it leads, we
ought to consider the mind of man and the universe as the great
whole on which to exercise our speculations. Here, above all,
verbal disputes ought to be laid aside, though this has long been
their chosen field of battle. It imports little to inquire whether
thought be distinct from the objects of thought. The use of the
words EXTERNAL and INTERNAL, as applied to the establishment of this
distinction, has been the symbol and the source of much dispute.
This is merely an affair of words, and as the dispute deserves, to
say, that when speaking of the objects of thought, we indeed only
describe one of the forms of thought--or that, speaking of thought,
we only apprehend one of the operations of the universal system of


1. Let us reflect on our infancy, and give as faithfully as possible
a relation of the events of sleep.

And first I am bound to present a faithful picture of my own peculiar
nature relatively to sleep. I do not doubt that were every individual
to imitate me, it would be found that among many circumstances
peculiar to their individual nature, a sufficiently general
resemblance would be found to prove the connexion existing between
those peculiarities and the most universal phenomena. I shall employ
caution, indeed, as to the facts which I state, that they contain
nothing false or exaggerated. But they contain no more than certain
elucidations of my own nature; concerning the degree in which
it resembles, or differs from, that of others, I am by no means
accurately aware. It is sufficient, however, to caution the reader
against drawing general inferences from particular instances.

I omit the general instances of delusion in fever or delirium, as
well as mere dreams considered in themselves. A delineation of this
subject, however inexhaustible and interesting, is to be passed
over. What is the connexion of sleeping and of waking?

2. I distinctly remember dreaming three several times, between
intervals of two or more years, the same precise dream. It was
not so much what is ordinarily called a dream; the single image,
unconnected with all other images, of a youth who was educated at
the same school with myself, presented itself in sleep. Even now,
after the lapse of many years, I can never hear the name of this
youth, without the three places where I dreamed of him presenting
themselves distinctly to my mind.

3. In dreams, images acquire associations peculiar to dreaming; so
that the idea of a particular house, when it recurs a second time
in dreams, will have relation with the idea of the same house, in
the first time, of a nature entirely different from that which the
house excites, when seen or thought of in relation to waking ideas.

4. I have beheld scenes, with the intimate and unaccountable
connexion of which with the obscure parts of my own nature, I
have been irresistibly impressed. I have beheld a scene which has
produced no unusual effect on my thoughts. After the lapse of many
years I have dreamed of this scene. It has hung on my memory, it
has haunted my thoughts, at intervals, with the pertinacity of an
object connected with human affections. I have visited this scene
again. Neither the dream could be dissociated from the landscape,
nor the landscape from the dream, nor feelings, such as neither
singly could have awakened, from both.

But the most remarkable event of this nature, which ever occurred
to me, happened five years ago at Oxford. I was walking with
a friend, in the neighbourhood of that city, engaged in earnest
and interesting conversation. We suddenly turned the corner of a
lane, and the view, which its high banks and hedges had concealed,
presented itself. The view consisted of a wind-mill, standing
in one among many plashy meadows, inclosed with stone walls; the
irregular and broken ground, between the wall and the road on which
we stood; a long low hill behind the windmill, and a grey covering
of uniform cloud spread over the evening sky. It was that season
when the last leaf had just fallen from the scant and stunted ash.
The scene surely was a common scene; the season and the hour little
calculated to kindle lawless thought; it was a tame uninteresting
assemblage of objects, such as would drive the imagination for
refuge in serious and sober talk, to the evening fireside, and the
dessert of winter fruits and wine. The effect which it produced on
me was not such as could have been expected. I suddenly remembered
to have seen that exact scene in some dream of long--. [Footnote:
Here I was obliged to leave off, overcome by thrilling horror.]

[written c.1815; pub. 1840]

Percy Bysshe Shelley

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