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in sleep, in a fever, in madness, or in any very violent emotions of |
soul, our ideas may approach to our impressions, As on the other hand |
it sometimes happens, that our impressions are so faint and low, that |
we cannot distinguish them from our ideas. But notwithstanding this near |
resemblance in a few instances, they are in general so very different, |
that no-one can make a scruple to rank them under distinct heads, and |
assign to each a peculiar name to mark the difference.[1] |
[1] I here make use of these terms, _impression and idea_, in a |
sense different from what is usual, and I hope this liberty will be |
allowed me. Perhaps I rather restore the word, idea, to its |
original sense, from which Mr Locke had perverted it, in making it |
stand for all our perceptions. By the terms of impression I would |
not be understood to express the manner, in which our lively |
perceptions are produced in the soul, but merely the perceptions |
themselves; for which there is no particular name either in the |
_English_ or any other language, that I know of. |
There is another division of our perceptions, which it will be |
convenient to observe, and which extends itself both to our impressions |
and ideas. This division is into SIMPLE and COMPLEX. Simple perceptions |
or impressions and ideas are such as admit of no distinction nor |
separation. The complex are the contrary to these, and may be |
distinguished into parts. Though a particular colour, taste, and smell, |
are qualities all united together in this apple, it is easy to perceive |
they are not the same, but are at least distinguishable from each other. |
Having by these divisions given an order and arrangement to our objects, |
we may now apply ourselves to consider with the more accuracy their |
qualities and relations. The first circumstance, that strikes my eye, is |
the great resemblance betwixt our impressions and ideas in every other |
particular, except their degree of force and vivacity. The one seem to |
be in a manner the reflexion of the other; so that all the perceptions |
of the mind are double, and appear both as impressions and ideas. When |
I shut my eyes and think of my chamber, the ideas I form are exact |
representations of the impressions I felt; nor is there any circumstance |
of the one, which is not to be found in the other. In running over my |
other perceptions, I find still the same resemblance and representation. |
Ideas and impressions appear always to correspond to each other. This |
circumstance seems to me remarkable, and engages my attention for a |
moment. |
Upon a more accurate survey I find I have been carried away too far by |
the first appearance, and that I must make use of the distinction of |
perceptions into simple and complex, to limit this general decision, |
that all our ideas and impressions are resembling. I observe, that many |
of our complex ideas never had impressions, that corresponded to them, |
and that many of our complex impressions never are exactly copied in |
ideas. I can imagine to myself such a city as the New Jerusalem, whose |
pavement is gold and walls are rubies, though I never saw any such. |
I have seen Paris; but shall I affirm I can form such an idea of that |
city, as will perfectly represent all its streets and houses in their |
real and just proportions? |
I perceive, therefore, that though there is in general a great, |
resemblance betwixt our complex impressions and ideas, yet the rule is |
not universally true, that they are exact copies of each other. We may |
next consider how the case stands with our simple, perceptions. After |
the most accurate examination, of which I am capable, I venture to |
affirm, that the rule here holds without any exception, and that every |
simple idea has a simple impression, which resembles it, and every |
simple impression a correspondent idea. That idea of red, which we form |
in the dark, and that impression which strikes our eyes in sun-shine, |
differ only in degree, not in nature. That the case is the same with |
all our simple impressions and ideas, it is impossible to prove by a |
particular enumeration of them. Every one may satisfy himself in this |
point by running over as many as he pleases. But if any one should deny |
this universal resemblance, I know no way of convincing him, but by |
desiring him to shew a simple impression, that has not a correspondent |
idea, or a simple idea, that has not a correspondent impression. If he |
does not answer this challenge, as it is certain he cannot, we may from |
his silence and our own observation establish our conclusion. |
Thus we find, that all simple ideas and impressions resemble each other; |
and as the complex are formed from them, we may affirm in general, |
that these two species of perception are exactly correspondent. Having |
discovered this relation, which requires no farther examination, I am |
curious to find some other of their qualities. Let us consider how they |
stand with regard to their existence, and which of the impressions and |
ideas are causes, and which effects. |
The full examination of this question is the subject of the present |
treatise; and therefore we shall here content ourselves with |
establishing one general proposition, THAT ALL OUR SIMPLE IDEAS IN |
THEIR FIRST APPEARANCE ARE DERIVED FROM SIMPLE IMPRESSIONS, WHICH ARE |
CORRESPONDENT TO THEM, AND WHICH THEY EXACTLY REPRESENT. |
In seeking for phenomena to prove this proposition, I find only those |
of two kinds; but in each kind the phenomena are obvious, numerous, and |
conclusive. I first make myself certain, by a new, review, of what I |
have already asserted, that every simple impression is attended with |
a correspondent idea, and every simple idea with a correspondent |
impression. From this constant conjunction of resembling perceptions |
I immediately conclude, that there is a great connexion betwixt our |
correspondent impressions and ideas, and that the existence of the one |
has a considerable influence upon that of the other. Such a constant |
conjunction, in such an infinite number of instances, can never arise |
from chance; but clearly proves a dependence of the impressions on the |
ideas, or of the ideas on the impressions. That I may know on which side |
this dependence lies, I consider the order of their first appearance; |