Pliny the Younger (A.D. 62?–c.A.D. 113). Letters.
The Harvard Classics. 1909–14.
CXVI. Trajan to Pliny
YOU might well be doubtful, my dearest Secundus, what reply to give to the censors, who consulted you concerning their right to elect into the senate foreign citizens, though of the same province. The authority of the law on one side, and long custom prevailing against it on the other, might justly occasion you to hesitate. The proper mean to observe in this case will be to make no change in what is past, but to allow those senators who are already elected, though contrary to law, to keep their seats, to whatever city they may belong; in all future elections, however, to pursue the directions of the Pompeian law: for to give it a retrospective operation would necessarily introduce great confusion.