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 without stopping to define them to no purpose, it penetrates their nature and discovers their marvellous properties.

These three things which comprehend the whole universe, according to the words: Deus fecit omnia in pondere, in numero, et mensura, have a reciprocal and necessary connection. For we cannot imagine motion without something that moves; and this thing being one, this unity is the origin of all numbers; and lastly, motion not being able to exist without space, we see these three things included within the first.

Time even is also comprehended in it; for motion and time are relative to each other; speed and slowness, which are the differences of motion, having a necessary relation to time.

Thus there are properties common to all these things, the knowledge of which opens the mind to the greatest marvels of nature.

The chief of these comprehends the two infinitudes which are combined in every thing: the one of greatness the other of littleness.

For however quick a movement may be, we can conceive of one still more so; and so on ad infinitum, without ever reaching one that would be swift to such a degree that nothing more could be added to it. And, on the contrary, however slow a movement may be, it can be retarded still more; and thus ad infinitum, without ever reaching such a degree of slowness that we could not thence descend into an infinite number of others, without falling into rest.

In the same manner, however great a number may be, we can conceive of a greater; and thus ad infinitum, without ever reaching one that can no longer be increased. And on the contrary, however small a number may be, as the hundredth or ten thousandth part, we can still conceive of a less; and so on ad infinitum, without ever arriving at zero or nothingness.

However great a space may be, we can conceive of a greater; and thus ad infinitum, without ever arriving at one which can no longer be increased. And, on the contrary, however small a space may be, we can still imagine a smaller; and so on ad infinitum, without ever arriving at one indivisible, which has no longer any extent.