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Extent in respect of Universality.
      §31. Hitherto we have examined the extent of our Knowledge, in
respect of the several sorts of Beings that are. There is another
extent of it, in respect of universality, which will also deserve to be
considered: and in this regard, our Knowledge follows the Nature
of our Ideas. If the Ideas are abstract, whose agreement or disagree-
ment we perceive, our Knowledge is universal. For what is known
of such general Ideas, will be true of every particular thing, in whom
that Essence, i.e. that abstract Idea is to be found: and what is once
known of such Ideas, will be perpetually, and for ever true. So that
as to all general Knowledge, we must search and find it only in our
own Minds, and ’tis only the examining of our own Ideas, that
furnisheth us with that. Truths belonging to Essences of Things,
(that is, to abstract Ideas) are eternal, and are to be found out by the
contemplation only of those Essences: as the Existence of Things is
to be known only from Experience. But having more to say of this
in the Chapters, where I shall speak of general and real Knowledge,
this may here suffice, as to the Universality of our Knowledge in
general.
Locke Hum IV, 3, §31, p. 562