Plutarch, Animine an corporis affectiones sint peiores, section 4 4:

ὁρᾶτε τὸν πολὺν καὶ παμμιγῆ τοῦτον τὸν ἐνταῦθα συνηραγμένον καὶ κυκώμενον ὄχλον περὶ τὸ βῆμα καὶ τὴν ἀγοράν;