εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses
gnōmon: ŏnis, m., = γνώμων,
I the pin or style of a sundial, the gnomon, Plin. 2, 72, 74, § 182; Vitr. 1, 6; 9, 8; Mart. Cap. 6, 194.