Well here’s the full quote…

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.’”

Oh, you meant the pillar…