if your thought is concentrated upon one thing—say, the point of a needle—it is located there in the sense that it is not elsewhere; but although it is “there,” it occupies no space there, and there is nothing to prevent an infinite number of different people’s thoughts being concentrated upon the same needle-point at the same time. The proper subject of the argument is thus seen to be the distinction between location and extension in space; the matter on which the argument is exercised happens to be the nature of angels (although, as we have seen, it might equally well have been something
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