Page:Essays on the Principles of Human Action (1835).djvu/181

 please, I would ask whether the actual height to which it amounts, does not consist of a number of other lengths: as if it be a tall man, the length will be six feet, and each of these feet will consist of so many inches, and those inches will be again made up of decimals, and those decimals of other subordinate parts, which must be all distinctly placed, and added together before the sum total, which they compose, can be pretended to be a distinct particular, or individual idea; I can only understand by a particular thing either one precise individual, or a precise number of individuals.

Instead of its being true that all general ideas of extension are deducible to particular positive extension, the reverse proportion is I think demonstrable: that all particular extensions, the most positive and distinct, are never any thing else than a more or less vague notion of extension in general. In any given visible object we have always the general idea of something extended, and never of the precise length; for the precise length as it is thought to be is necessarily composed of a number of lengths too many, and too minute to be necessarily attended to, or jointly conceived by the mind, and at last loses itself in the infinite divisibility of matter. What sort of distinctness or individual can therefore be found in any visible image, or object of sense, I cannot well conceive: it seems to me like seeking for certainty in the dancing of insects in the evening sun, or for fixedness or rest in the motions of the sea. All particulars are thought nothing but generals, more or less defined by circumstances, but never perfectly so; in this all our knowledge both begins and ends, and if we think to exclude all generality from our ideas of things, we must be content to remain in utter ignorance. The proof that our ideas of particular things are not themselves