Note 3
From Chapter 36 of the Decline & Fall

Districtus ensis cui super impiâ
Cervice pendet, non Siculæ dapes
Dulcem elaborabunt saporem:
Non avium citharæque cantus
Somnum reducent. Horat. Carm. iii. 1.

Sidonius concludes his letter with the story of Damocles, which Cicero (Tusculan. v. 20, 21) had so inimitably told.