— 186 —
      §14. For Trial, let him take any Figure, any Degree of Light or
Whiteness, or what other he pleases; and he will, I suppose, find it
difficult to keep all other Ideas out of his Mind: But that some, either
of another kind, or various Consideration of that Idea (each of
which Considerations is a new Idea ) will constantly succeed one
another in his Thoughts, let him be as wary as he can.
Locke Hum II, 14, §14, p. 186