A slight (and very hopeful) addition to what Dr. J says: while we don’t presently have access to original manuscripts from the classical world, that’s not to say there’s no hope. As I understand it, Julius Caesar’s father-in-law’s villa has yielded abundant ancient manuscripts, and there’s reason to believe many unknown works remain to be unearthed there. As the vast majority of works by all three of the great Greek tragedians, all but one of Aristotle’s collected constitutions, most of the writings of Aristophanes, most of the Athenian orators’ oratory, some of Plato’s dialogues, etc., are now unknown, perhaps great wonders await.