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All Relations terminate in simple Ideas.       §18. First, That it is evident, That all Relation terminates in, and
is ultimately founded on those simple Ideas, we have got from Sen-
sation, or Reflection: So that all that we have in our Thoughts our
selves, (if we think of any thing, or have any meaning,) or would
signify to others, when we use Words, standing for Relations, is
nothing but some simple Ideas, or Collections of simple Ideas,
compared one with another. This is so manifest in that sort called
proportional, that nothing can be more. For when a Man says, Honey
is sweeter than Wax, it is plain, that his Thoughts in this Relation,
terminate in this simple Idea, Sweetness, which is equally true of all
the rest; though, where they are compounded, or decompounded,
the simple Ideas, they are made up of, are, perhaps, seldom taken
notice of: v.g. when the Word Father is mentioned: First, There is
meant that particular Species, or collective Idea, signified by the
Word Man; Secondly, Those sensible simple Ideas, signified by the
Word Generation; And, Thirdly, The Effects of it, and all the simple
Ideas, signified by the Word Child. So the Word Friend, being taken
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for a Man, who loves, and is ready to do good to another, has all
those following Ideas to the making of it up. First, all the simple
Ideas, comprehended in the Word Man, or intelligent Being.
Secondly, The Idea of Love. Thirdly, The Idea of Readiness, or Dispo-
sition. Fourthly, The Idea of Action, which is any kind of Thought,
or Motion. Fifthly, The Idea of Good, which signifies any thing that
may advance his Happiness; and terminates at last, if examined, in
particular simple Ideas, of which the Word Good in general, signifies
any one, but if removed from all simple Ideas quite, it signifies
nothing at all. And thus also, all Moral Words terminate at last,
though, perhaps, more remotely, in a Collection of simple Ideas:
the immediate signification of Relative Words, being very often
other supposed known Relations; which, if traced one to another,
still end in simple Ideas.
Locke Hum II, 28, §18, pp. 360-361