A man who is asleep is in a different world from one
awake, the existence of both worlds being relative to the
condition of waking and sleeping.[2]
The subjective states which Sextus mentions here as modifying
the character of the mental representations are hating or
loving, courage or fear, sorrow or joy, and sanity or
insanity.[3] No man is ever twice in exactly the same condition
of body or mind, and never able to review the differences of his
ideas as a sum total, for those of the present moment only are
subject to careful inspection.[4] Furthermore, no one is free
from the influence of all conditions of body or mind, so that he
can be unbiassed to judge his ideas, and no criterion can be
established that can be shown to be true, but on the contrary,
whatever course is pursued on the subject, both the criterion
and the proof will be thrown into the _circulus in probando_,
for the truth of each rests on the other.[5]
[1] _Hyp._ I. 100.
[2] _Hyp._ I. 104.
[3] _Hyp._ I. 100.
[4] _Hyp._ I. 112.
[5] _Hyp._ I. 117.
Diogenes gives in part the same illustrations of this Trope, but
in a much more condensed form. The marked characteristic of this
train of reasoning is the attempt to prove that abnormal
conditions are also natural. In referring at first to the
opposing states of body and mind, which so change the character
of sense-perception, Sextus classifies them according to the
popular usage as [Greek: kata physin] and [Greek: para physin].
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