"That the most pleasant delight occurs in madness, Heraclides of Pontus relates nicely in his book On Pleasure. He writes:
'Thrasyllus from Aexone, the son of Pythodorus, once went so mad that he thought all the ships landing in the Piraeus belonged to him. He would keep an inventory of them, he would dispatch them, he would manage their affairs; when they sailed home, he would receive them with the kind of joy which you might expect from someone who was really in charge of such great wealth; and when ships were lost, he did not inquire after them, but he rejoiced at every one that came back safely. And so he passed his days in the greatest delight. But when his brother Crito came home from Sicily, he took him and gave him to a doctor who relieved him of his madness. Afterwards, Thrasyllus said that [when he was overcome by madness] he had never been happier in his life, since it never occurred to him to feel any pain, while the amount of joy he felt exceeded all bounds.'"
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)