The man's a fool and has the mind of a polypus.
Ἡλίθιον εἶναι νοῦν τε πουλύποδος ἔχειν.
Original text (Ancient Greek)
Attribution
Quote text and notes from Wikiquote: Alcaeus (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.