“If you haven’t seen Athens, you’re a stump.
If you’ve seen it unamazed, you’re a donkey.
If after being charmed by it you leave, you’re an ass.”

εἰ μὴ τεθέασαι τὰς Ἀθήνας, στέλεχος εἶ
εἰ δὲ τεθέασαι μὴ τεθήρευσαι δ᾿, ὄνος,
εἰ δ᾿ εὐαρεστῶν αποτρέχεις, κανθήλιος

Lysippus? A poet of Old Comedy who won a victory around 440 BCE.