[12]
Otherwise there will be nothing
by which we can prove anything; there must be
something which either is or is believed to be true,
by means of which doubtful things may be rendered
credible. We may regard as certainties, first, those
things which we perceive by the senses, things for
instance that we hear or see, such as signs or indications; secondly, those things about which there is
general agreement, such as the existence of the gods
or the duty of loving one's parents;
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