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.