amaro
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγὴ τοῦ ἀγαθοῦ καὶ ἀεὶ ἀναβλύειν δυναμένη, ἐὰν ἀεὶ σκάπτῃς → Dig within. Within is the wellspring of Good; and it is always ready to bubble up, if you just dig | Look within. Within is the fountain of the good, and it will ever bubble up, if thou wilt ever dig.
ămārō, āre (amarus), tr., rendre amer : Avien. Carm. ad Flav. 21.
amāro, āre (amarus), bitter machen, Avien. carm. ad Flav. 21.