Where is it? Where is it not? Whence comes it? What is its
source? What is its end? It surrounds us, it intrudes upon us, and yet
escapes us. It is evident as a fact, obscure as an abstraction; it is
at once effect and cause. It requires space, even as we, and what is
space? Movement alone recalls it to us; without movement, space is but
an empty meaningless word. Like space, like creation, like the
infinite, movement is an insoluble problem which confounds human
reason; man will never conceive it, whatever else he may be permitted
to conceive.
"Between each point in space occupied in succession by that ball,"
continued the man of science, "there is an abyss confronting human
reason, an abyss into which Pascal fell. In order to produce any
effect upon an unknown substance, we ought first of all to study that
substance; to know whether, in accordance with its nature, it will be
broken by the force of a blow, or whether it will withstand it; if it
breaks in pieces, and you have no wish to split it up, we shall not
achieve the end proposed. If you want to compress it, a uniform
impulse must be communicated to all the particles of the substance, so
as to diminish the interval that separates them in an equal degree.
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