Kitap 1
15.18
Evidence partly concerns ourselves, partly our adversary, as to the fact itself or moral character; so that it is evident that one never need lack useful evidence. For, if we have no evidence as to the fact itself, neither in confirmation of our own case nor against our opponent, it will always be possible to obtain some evidence as to character that will establish either our own respectability or the worthlessness of our opponent.
15.19
As for all the other questions relative to a witness, whether he is a friend, an enemy, or neutral, of good or bad or middling reputation, and for all other differences of this kind, we must have recourse to the same topics as those from which we derive our enthymemes.
15.20
As for contracts, argument may be used to the extent of magnifying or minimizing their importance, of proving that they do or do not deserve credit. If we have them on our side, we must try to prove them worthy of credit and authoritative; but if they are on the side of our opponent, we must do the opposite.
