— 184 —
      §7. And this, I think, is the Reason, why Motions very slow, though
they are constant, are not perceived by us; because in their remove
from one sensible part towards another, their change of distance is
so slow, that it causes no new Ideas in us, but a good while one after
another: And so not causing a constant train of new Ideas, to follow
one another immediately in our Minds, we have no Perception of
Motion; which consisting in a constant Succession, we cannot
perceive that Succession, without a constant Succession of varying
Ideas arising from it.
Locke Hum II, 14, §7, p. 184