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.