7. Very slow motions unperceived.
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.
