Institutio Oratoria

Nor can I see how we can turn a more honest penny than by performance of the most honourable of tasks and by accepting money from those to whom we have rendered the most signal services and who, if they made no return for what we have done for them, would show themselves undeserving to have been defended by us. Nay, it is not only just, but necessary that this should be so, since the duties of advocacy and the bestowal of every minute of our time on the affairs of others deprive us of all other means of making money.