“In his book On Pleasure, Heraclides of Pontus relates not unpleasantly that a most pleasant luxury occured during a fit of madness. He writes:

‘Thrasyllus from Aexone, the son of Pythodorus, once went so mad that he thought all the ships arriving at Piraeus were his own. He would register them, dispatch them, and manage their affairs. When they returned to port, he would welcome them with the kind of joy you might expect from someone who was really in charge of such great wealth. When ships were lost, he did not inquire after them, but he rejoiced at every one that was saved and recounted it with greatest delight. When his brother Crito came to visit from Sicily, he took him into custody, handed him over to a doctor, and put an end to his madness. Afterwards, Thrasyllus would tell the story, saying that he had never in his life been happier, for he felt not pain whatsoever, while the amount of pleasure he felt was overwhelming.’”

ἐν μανίᾳ δὲ τρυφὴν ἡδίστην γενομένην οὐκ ἀηδῶς ὁ Ποντικὸς Ἡρακλείδης διηγεῖται ἐν τῷ περὶ Ἡδονῆς οὕτως γράφων· ‘ὁ Αἰξωνεὺς Θράσυλλος ὁ Πυθοδώρου διετέθη ποτὲ ὑπὸ μανίας τοιαύτης ὡς πάντα τὰ πλοῖα τὰ εἰς τὸν Πειραιᾶ καταγόμενα ὑπολαμβάνειν ἑαυτοῦ εἶναι, καὶ ἀπεγράφετο αὐτὰ καὶ ἀπέστελλε καὶ διῴκει καὶ καταπλέοντα ἀπεδέχετο μετὰ χαρᾶς τοσαύτης ὅσησπερ ἄν τις ἡσθείη τοσούτων χρημάτων κύριος ὤν. καὶ τῶν μὲν ἀπολομένων οὔτε ἐπεζήτησεν, τοῖς δὲ σῳζομένοις ἔχαιρεν καὶ διῆγεν μετὰ πλείστης ἡδονῆς. ἐπεὶ δὲ ὁ ἀδελφὸς αὐτοῦ Κρίτων ἐκ Σικελίας ἐπιδημήσας συλλαβὼν αὐτὸν παρέδωκεν ἰατρῷ καὶ τῆς μανίας ἐπαύσατο, διηγεῖτο <...> οὐδεπώποτε φάσκων κατὰ τὸν βίον ἡσθῆναι πλείονα· λύπην μὲν γὰρ οὐδ' ἡντινοῦν αὐτῷ παραγίνεσθαι, τὸ δὲ τῶν ἡδονῶν πλῆθος ὑπερβάλλειν.’ 

Athenaeus, Deipnosophistae 12.81 (p.223-4 Kaibel)