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Chapter XV

Of Duration and Expansion, considered together
.
Both capable of greater and less.       §1. Though we have in the precedent Chapters dwelt pretty
long on the Considerations of Space and Duration; yet they being
Ideas of general concernment, that have something very abstruse
and peculiar in their Nature, the comparing them one with another
may, perhaps, be of use for their illustration; and we may have the
more clear and distinct conception of them, by taking a view of
them together. Distance or Space, in its simple abstract conception,
to avoid confusion, I call Expansion, to distinguish it from Extension,
which by some is used to express this distance only as it is in the
solid parts of Matter, and so includes, or at least intimates the Idea
of Body: Whereas the Idea of pure Distance includes no such thing.
I prefer also the Word Expansion to Space, because Space is often
applied to Distance of fleeting successive parts, which never exist
together, as well as to those which are permanent. In both these,
( viz.) Expansion and Duration, the Mind has this common Idea of
continued Lengths, capable of greater, or less quantities: For a
Man has as clear an Idea of the difference of the length of an Hour,
and a Day, as of an Inch and a Foot.
Locke Hum II, 15, §1, p. 196