Institutio Oratoria

When the accusation is simple, we must consider whether to give a single answer to the charge or several. In the former case, we must decide whether the question is one of fact or of law: if it is one of fact, we must deny the fact or justify it: if, on the other hand, it is a question of law, we must decide on what special point the dispute arises and whether the question turns on the letter or the intention of the law.