Institutio Oratoria

III. Our orator will also require a knowledge of civil law and of the custom and religion of the state in whose life he is to bear his part. For how will he be able to advise either in public or in private, if he is ignorant of all the main elements that go to make the state? How can he truthfully call himself an advocate if he has to go to others to acquire that knowledge which is all-important in the courts? He will be little better than if he were a reciter of the poets.