Many ideas require others, as
necessary to their existence or conception, which yet are very distinct
ideas. Motion can neither be, nor be conceived, without space; and yet
motion is not space, nor space motion; space can exist without it, and
they are very distinct ideas; and so, I think, are those of space and
solidity. Solidity is so inseparable an idea from body, that upon that
depends its filling of space, its contact, impulse, and communication
of motion upon impulse. And if it be a reason to prove that spirit is
different from body, because thinking includes not the idea of extension
in it; the same reason will be as valid, I suppose, to prove that space
is not body, because it includes not the idea of solidity in it; SPACE
and SOLIDITY being as distinct ideas as THINKING and EXTENSION, and as
wholly separable in the mind one from another. Body then and extension,
it is evident, are two distinct ideas. For,
12. Extension not solidity.
First, Extension includes no solidity, nor resistance to the motion of
body, as body does.
13. The parts of space inseparable, both really and mentally.
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