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Chapter IX

Of Perception.
It is the first simple Idea of Reflection.       §1. Perception, as it is the first faculty of the Mind, exercised
about our Ideas; so it is the first and simplest Idea we have from
Reflection, and is by some called Thinking in general. Though
Thinking, in the propriety of the English Tongue, signifies that
sort of operation of the Mind about its Ideas, wherein the Mind is
active; where it with some degree of voluntary attention, considers
any thing. For in bare naked Perception, the Mind is, for the most
part, only passive; and what it perceives, it cannot avoid perceiving.
Locke Hum II, 9, §1, p. 143