OK, I haven't mentioned the king of all classical literature IMO (setting aside my religious affinity for the Bible and some Church Fathers). I must now quote Homer. The Iliad is the single most beautiful poem I have ever read, and frankly, it's worth a bit of struggle to learn Homeric Greek to read, and it's worth just as much struggle to learn the Reconstructed Attic Pronunciation alongside the Modern (which should be the primary pronunciation used for Greek) simply because it simply adds to the spice.
Iliad A lines 1-5
Μῆνιν ἄειδε, θεά, Πηληιάδεω Ἀχιλῆος
οὐλομένην, ἣ μυρί᾽ Ἀχαιοῖς ἄλγε᾽ ἔθηκε,
πολλὰς δ᾽ ἰφθίμους ψυχὰς Ἄϊδι προΐαψεν
ἡρώων, αὐτοὺς δὲ ἑλώρια τεῦχε κύνεσσιν
οἰωνοῖσί τε πᾶσι, Διὸς δ᾽ ἐτελείετο βουλή,
Sing, goddess, of the rage of Peleus' son, Achilles,
The murderous rage, which fashioned suffering for many Achaeans,
and hurled the many mighty lives of warriors to Hades,
and fashioned them to be a feast for birds,
and every bird, but the plan of Zeus was being fulfilled.
That's just a portion of the prologue, but I memorized most of it. It's a very moving piece, and the power simply doesn't come through in translation. I would reccomend many people to learn to read Homeric Greek simply because of the beauty
.