The common effects of poetry, not by raising ideas of things.

The common notion of the power of poetry and eloquence, as well as that of words in ordinary conversation, is, that they affect the mind by raising in it ideas of those things for which custom has appointed them to stand. To examine the truth of this notion, it may be requisite to observe that words may be divided into three sorts. The first are such as represent many simple ideas united by nature to form some one determinate composition, as man, horse, tree, castle, &c. These I call aggregate words. The second are they that stand for one simple idea of such compositions, and no more; as red, blue, round, square, and the like. These I call simple abstract words. The third are those which are formed by an union, an arbitrary union of both the others, and of the various relations between them in greater or lesser degrees of complexity; as virtue, honor, persuasion, magistrate, and the like. These I call compound abstract words. Words, I am sensible, are capable of being classed into more curious distinctions; but these seem to be natural, and enough for our purpose; and they are disposed in that order in which they are commonly taught, and in which the mind gets the ideas they are substituted for. I shall begin with the third sort of words; compound abstracts, such as virtue, honor, persuasion, docility. Of these I am convinced, that whatever power they may have on the passions, they do not derive it from any representation raised in the mind of the things for which they stand. As compositions, they are not real essences, and hardly cause, I think, any real ideas. Nobody, I believe, immediately on hearing the sounds, virtue, liberty, or honor, conceives any precise............