If without
proof, he will be untrustworthy; if he says that it is true with
proof, it is certainly necessary that the proof be true, or he
will be untrustworthy. Now will he say that the proof which he
has accepted for the accrediting of the criterion is true,
having judged it, or without having judged it? If he says so 116
without judging it, he will be untrustworthy; if he has judged
it, it is evident that he will say that he has judged according
to some criterion, and we must seek a proof for this criterion,
and for that proof a criterion. For the proof always needs a
criterion to establish it, and the criterion needs a proof that
it may be shown to be true; and a proof can neither be sound
without a pre-existing criterion that is true, nor a criterion
true without a proof that is shown beforehand to be trustworthy.
And so both the criterion and the proof are thrown into the 117
_circulus in probando_, by which it is found that they are both
of them untrustworthy, for as each looks for proof from the
other, each is as untrustworthy as the other. Since then one
cannot prefer one idea to another, either without a proof and a
criterion or with them, the ideas that differ according to
different conditions cannot be judged, so that the suspension of
judgment in regard to the nature of external objects follows
through this Trope also.
THE FIFTH TROPE.
The fifth Trope is that based upon position, distance, and 118
place, for, according to each of these, the same things appear
different, as for example, the same arcade seen from either end
appears curtailed, but from the middle it looks symmetrical on
every side; and the same ship appears small and motionless from
afar, and large and in motion near by, and the same tower
appears round from a distance, but square near by.
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