Lastly, if they find it surprising that a small space has as many parts as a great one, let them understand also that they are smaller in measure, and let them look at the firmament through a diminishing glass, to familiarize themselves with this knowledge, by seeing every part of the sky in every part of the glass.
But if they cannot comprehend that parts so small that to us they are imperceptible, can be divided as often as the firmament, there is no better remedy than to make them look through glasses that magnify this delicate point to a prodigious mass; whence they will easily conceive that by the aid of another glass still more artistically cut, they could be magnified so as to equal that firmament the extent of which they admire. And thus these objects appearing to them now easily divisible, let them remember that nature can do infinitely more than art.
For, in fine, who has assured them that these glasses change the natural magnitude of these objects, instead of re-establishing, on the contrary, the true magnitude which the shape of our eye may change and contract like glasses that diminish?
It is annoying to dwell upon such trifles; but there are times for trifling.
It suffices to say to minds clear on this matter that two negations of extension cannot make an extension. But as there are some who pretend to elude this light by this marvellous answer, that two negations of extension can as well make an extension as two units, neither of which is a number, can make a number by their combination; it is necessary to reply to them that they might in the same manner deny that twenty thousand men make an army, although no single one of them is an army; that a thousand houses make a town, although no single one is a town; or that the parts make the whole, although no single one is the whole; or, to remain in the comparison of numbers, that two binaries make a quaternary, and ten tens a hundred, although no single one is such.
But it is not to have an accurate mind to confound by such unequal comparisons the immutable nature of things with their arbitrary and voluntary names, names dependent
