Seneca · On being
Letters 58.5
It is not in my purpose to show, by this array of examples, how much time I have wasted on the study of language; I merely wish you to understand how many words, that were current in the works of Ennius and Accius, have become mouldy with age; while even in the case of Vergil, whose works are explored daily, some of his words have been filched away from us.
Seneca, Letters to Lucilius 58.5, translated by Richard Mott Gummere