Quintilian Institutio Oratoria 5.13.7

[7] On the other hand, when we are pleading before judges who have to give their verdict in accordance with the prescriptions of law, it would be absurd to give them advice as to how they should deal with a criminal who admits his guilt. Consequently, when it is impossible either to deny the facts or to raise the question of competence, we must attempt to justify the facts as best we can, or else throw up the case. I have pointed out that there are two ways in which a fact can be denied: it can be denied absolutely, or it may be denied that a fact is of the nature alleged. When it is impossible to plead justification or to raise the question of competence, ¹ we must deny the facts, and that not merely when a definition of the facts will serve our case, but even when nothing except an absolute denial is left for us.