BOOK I PART III
heat gives pleasure; if you diminish that heat,
the pleasure diminishes; but it does not follow,
that if you augment it beyond a certain degree,
the pleasure will likewise augment; for we find
that it degenerates into pain.
(8) The eighth and last rule I shall take no-
tice of is, that an object, which exists for any
time in its full perfection without any effect, is
not the sole cause of that effect, but requires to
be assisted by some other principle, which may
forward its influence and operation. For as like
effects necessarily follow from like causes, and
in a contiguous time and place, their separation
for a moment shews, that these causes are not
compleat ones.
Here is all thelogicI think proper to em-
ploy in my reasoning; and perhaps even this
was not very necessary, but might have been