νάβλα
From LSJ
ἔνδον σκάπτε, ἔνδον ἡ πηγή τοῦ ἀγαθοῦ καί ἀεί ἀναβλύειν δυναμένη, ἐάν ἀεί 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.
English (LSJ)
ἡ,
A a musical instrument of ten or (acc. to J.AJ7.12.3) of twelve strings, cj. in S.Fr.849, cf. LXX 1 Ki.10.5, al.:—also νάβλας, α, ὁ, Sopat.16, Philem.44, Str.10.3.17; cf. ναῦλον 1. (Semitic word, cf. Hebr. nēbel; Phoenician, acc. to Ath.4.175b.). II dub. sens. in acc. τὸν νάβλα, OGI175.9 (Egypt, ii B.C.).