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Extract from A TREATISE OF HUMAN NATURE:

Impressions way be divided into two kinds, those Of SENSATION and those of REFLEXION.
The first kind arises in the soul originally, from unknown causes.
The second is derived in a great measure from our ideas, and that in the following order.
An impression first strikes upon the senses, and makes us perceive heat or cold, thirst or hunger, pleasure or pain of some kind or other.
Of this impression there is a copy taken by the mind, which remains after the impression ceases; and this we call an idea.
This idea of pleasure or pain, when it returns upon the soul, produces the new impressions of desire and aversion, hope and fear, which may properly be called impressions of reflexion, because derived from it.
These again are copied by the memory and imagination, and become ideas; which perhaps in their turn give rise to other impressions and ideas.
So that the impressions of reflexion are only antecedent to their correspondent ideas; but posterior to those of sensation, and derived from them.
The examination of our sensations belongs more to anatomists and natural philosophers than to moral; and therefore shall not at present be entered upon.
And as the impressions of reflexion, viz.
passions, desires, and emotions, which principally deserve our attention, arise mostly from ideas, it will be necessary to reverse that method, which at first sight seems most natural; and in order to explain the nature and principles of the human mind, give a particular account of ideas, before we proceed to impressions.
For this reason I have here chosen to begin with ideas.
SECT. III. OF THE IDEAS OF THE MEMORY AND IMAGINATION.
We find by experience, that when any impression has been present with the mind, it again makes its appearance there as an idea; and this it may do after two different ways: either when in its new appearance it retains a considerable degree of its first vivacity, and is somewhat intermediate betwixt an impression and an idea: or when it entirely loses that vivacity, and is a perfect idea.
The faculty, by which we repeat our impressions in the first manner, is called the MEMORY, and the other the IMAGINATION.
It is evident at first sight, that the ideas of the memory are much more lively and strong than those of the imagination, and that the former faculty paints its objects in more distinct colours, than any which are employed by the latter.
When we remember any past event, the idea of it flows in upon the mind in a forcible manner; whereas in the imagination the perception is faint and languid, and cannot without difficulty be preserved by the mind steddy and uniform for any considerable time.
Here then is a sensible difference betwixt one species of ideas and another.
But of this more fully hereafter.[Part II, SECT. 5.]
There is another difference betwixt these two kinds of ideas, which:-s no less evident, namely that though neither the ideas, of the memory nor imagination, neither the lively nor faint ideas can make their appearance in the mind, unless their correspondent impressions have gone before to prepare the way for them, yet the imagination is not restrained to the same order and form with the original impressions; while the memory is in a manner tied down in that respect, without any power of variation.
It is evident, that the memory preserves the original form, in which its objects were presented, and that where-ever we depart from it in recollecting any thing, it proceeds from some defect or imperfection in that faculty.