Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
He will show all the diligence of which he is capable in his pleading. For to plead worse than he might have done, is not merely an indication of negligence, but stamps him as a had man and a traitor, disloyal to the cause which he has undertaken. Consequently he must refuse to undertake more cases than he feels he can manage.