Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The man who refuses to accept his opponent's offer to take an oath, will allege that the inequality of their respective conditions are not the same for both parties and will point out that many persons are not in the least afraid of committing perjury, even philosophers having been found to deny that the gods intervene in human affairs; and further that he who is ready to take an oath without being asked to do so, is really proposing to pass sentence on his own case and to show what an easy and trivial thing he thinks the oath which he offers to take.
On the other hand the man who proposes to put his opponent on oath appears to act with moderation, since he is making his adversary a judge in his own case, while he frees the actual judge from the burden of coming to a decision, since the latter would assuredly prefer to rest on another man's oath than on his own.
This fact makes the refusal to take an oath all the more difficult, unless indeed the affair in question be of such a nature that it cannot be supposed that the facts are known to the person asked to take the oath. Failing this excuse, there