I have dwelt the longer on this Subject, because I think it may shew us the proper Limits, as well as the Defectiveness of our Imagination; how it is confined to a very small Quantity of Space, and immediately stopt in its Operations, when it endeavours to take in any thing that is very great, or very little. Let a Man try to conceive the different Bulk of an Animal, which is twenty, from another which is a hundred times less than a Mite, or to compare, in his Thoughts, a length of a thousand Diameters of the Earth, with that of a Million, and he will quickly find that he has no different Measures in his Mind, adjusted to such extraordinary Degrees of Grandeur or Minuteness. The Understanding, indeed, opens an infinite Space on every side of us, but the Imagination, after a few faint Efforts, is immediately at a stand, and finds her self swallowed up in the Immensity of the Void that surrounds it: Our Reason can pursue a Particle of Matter through an infinite Variety of Divisions, but the Fancy soon loses sight of it, and feels in it self a kind of Chasm, that wants to be filled with Matter of a more sensible Bulk. We can neither widen, nor contract the Faculty to the Dimensions of either Extreme. The Object is too big for our Capacity, when we would comprehend the Circumference of a World, and dwindles into nothing, when we endeavour after the Idea of an Atome.
It is possible this defect of Imagination may not be in the Soul it self, but as it acts in Conjunction with the Body. Perhaps there may not be room in the Brain for such a variety of Impressions, or the Animal Spirits may be incapable of figuring them in such a manner, as is necessary to excite so very large or very minute Ideas. However it be, we may well suppose that Beings of a higher Nature very much excel us in this respect, as it is probable the Soul of Man will be infinitely more perfect hereafter in this Faculty, as well as in all the rest; insomuch that, perhaps, the Imagination will be able to keep Pace with the Understanding, and to form in it self distinct Ideas of all the different Modes and Quantities of Space.
O.
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