Passage 10.32.7
τὸ δὲ ἄντρον τὸ Κωρύκιον μεγέθει τε ὑπερβάλλει τὰ εἰρημένα καὶ ἔστιν ἐπὶ πλεῖστον ὁδεῦσαι διʼ αὐτοῦ καὶ ἄνευ λαμπτήρων· ὅ τε ὄροφος ἐς αὔταρκες ἀπὸ τοῦ ἐδάφους ἀνέστηκε, καὶ ὕδωρ τὸ μὲν ἀνερχόμενον ἐκ πηγῶν, πλέον δὲ ἔτι ἀπὸ τοῦ ὀρόφου στάζει, ὥστε καὶ δῆλα ἐν τῷ ἐδάφει σταλαγμῶν τὰ ἴχνη διὰ παντός ἐστι τοῦ ἄντρου. ἱερὸν δὲ αὐτὸ οἱ περὶ τὸν Παρνασσὸν Κωρυκίων τε εἶναι Νυμφῶν καὶ Πανὸς μάλιστα ἥγηνται. ἀπὸ δὲ τοῦ Κωρυκίου χαλεπὸν ἤδη καὶ ἀνδρὶ εὐζώνῳ πρὸς τὰ ἄκρα ἀφικέσθαι τοῦ Παρνασσοῦ· τὰ δὲ νεφῶν τέ ἐστιν ἀνωτέρω τὰ ἄκρα καὶ αἱ Θυιάδες ἐπὶ τούτοις τῷ Διονύσῳ καὶ τῷ Ἀπόλλωνι μαίνονται.
The Corycian cave surpasses in size those previously mentioned, and it is possible to proceed far into it even without torches. Its roof stands at a sufficient height above the floor, and water flows within it, some rising from springs, but even more dripping from the ceiling, so that the traces of drops are plainly visible everywhere throughout the cavern floor. The dwellers near Parnassus hold it to be sacred especially to the Corycian Nymphs and to Pan. From the Corycian cave onward, it becomes difficult even for a lightly equipped man to reach the very peaks of Parnassus. These peaks rise above the clouds, and it is there that the Thyiades revel in their madness, honoring Dionysus and Apollo.