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
neuter of a derivative from ἑκών; voluntariness: willingly.
ἑκούσιον: τό свободная воля Plat., Arst.
