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Chapter XXIII

Of Our Complex Ideas of Substances.
Ideas of Substances how made.       §1.The Mind being, as I have declared, furnished with a great
number of the simple Ideas, conveyed in by the Senses, as they are
found in exteriour things, or by Reflection on its own Operations,
takes notice also, that a certain number of these simple Ideas go
constantly together; which being presumed to belong to one thing,
and Words being suited to common apprehensions, and made use of
for quick dispatch, are called so united in one subject, by one name;
which by inadvertency we are apt afterward to talk of and consider
as one simple Idea, which indeed is a complication of many Ideas
together; Because, as I have said, not imagining how these simple
Ideas can subsist by themselves, we accustom our selves, to suppose
some Substratum, wherein they do subsist, and from which they do
result, which therefore we call Substance.
Locke Hum II, 23, §1, p. 295