Aelian, Varia Historia 4.14
πολλάκις τὰ κατ’ ὀβολὸν μετὰ πολλῶν πόνων συναχθέντα χρήματα κατὰ τὸν Ἀρχίλοχον εἰς πόρνης γυναικὸς ἔντερον καταρρέει. ὥσπερ γὰρ ἐχῖνον λαβεῖν μὲν ῥᾴδιον συνέχειν δὲ χαλεπόν, οὕτω καὶ τὰ χρήματα. καὶ Ἀναξαγόρας ἐν τῷ περὶ βασιλείας φησὶ χαλεπὸν χρήματα συναγείρασθαι, χαλεπώτερον δὲ φυλακὴν τούτοις περιθεῖναι.
According to Archilochus, wealth which has been collected penny by penny with many labours is often poured out into the belly of a prostitute; just as it is easy to catch a hedgehog and difficult to keep hold of it, so it is with money as well. Anaxagoras too says (in his book On Kingship) that it is difficult to get together money, but more difficult to keep a guard over it.