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
calmly: P. and V. ἡσυχῆ, ἡσύχως.
easily: P. and V. ῥᾳδίως, εὐπετῶς; see easily.
gently: P. and V. ἠπίως, P. πράως, Ar. and P. μαλακῶς, Ar. and V. μαλθακῶς.