— 526 —
Secondly, Relative.
      §5. Secondly, The next sort of Agreement, or Disagreement, the
Mind perceives in any of its Ideas, may, I think, be called Relative,
and is nothing but the Perception of the Relation between any two Ideas, of
what kind soever, whether Substances, Modes, or any other. For
since all distinct Ideas must eternally be known not to be the same,
and so be universally and constantly denied one of another, there
could be no room for any positive Knowledge at all, if we could not
perceive any Relation between our Ideas, and find out the Agree-
ment or Disagreement, they have one with another, in several ways
the Mind takes of comparing them.
Locke Hum IV, 1, §5, p. 526