Lines quoted by Strabo 9.2.40, tr. Horace Leonard Jones in Strabo, Geography, Books 8-9
(1927; rpt. Cambridge: Harvard University Press, 2001 = Loeb Classical Library, 196), p. 337:
Money is the most valuable thing to men, and it has the most power of all things among men.
The Greek (id., p. 336):
τὰ χρήματ᾿ ἀνθρώποισι τιμιώτατα,
δύναμίν τε πλείστην τῶν ἐν ἀνθρώποις ἔχει.
Strabo refers to this as a "common saying," but doesn't identify the source. Neither does Jones in his Loeb edition. The lines come from Euripides, Phoenician Women