Institutio Oratoria

Further, the true orator will not turn up his nose at cases of minor importance on the ground of their being beneath his dignity or as being likely to detract from his reputation because the subject matter does not allow his genius full scope. For the strongest reason for undertaking a case is to be fund in our duty towards our clients: nay, we should even desire the suits in which our friends are involved to he as unimportant as possible, and remember that the advocate who gives an adequate presentment to his case, has spoken exceeding well.