The Aeneid by Virgil Book 6 Page 9

He is was who prayed and charged me humbly to seek you and draw near to your threshold. Pity both son and sire, I beseech you, gracious one; for you are all-powerful, and not in vain did Hecate make you mistress in the groves of Avernus. If Orpheus availed to summon his wife’s shade, strong in his Thracian lyre and tuneful strings; if Pollux, dying in turn, ransomed his brother and so many times comes and goes his way – why speak of Theseus, why of Hercules the mighty – I, too, have descent from Jove most high!”

In such words he prayed and clasped the altar, when thus the prophetess began to speak: “Sprung from blood of gods, son of Trojan Anchises, easy is the descent to Avernus: night and day the door of gloomy Dis stands open; but to recall one’s steps and pass out to the upper air, this is the task, this the toil!