δουλεύειν
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.
Greek > English (Woodhouse Verbs Reversed)
(see also δουλεύω): be a slave to, be a slave
Lexicon Thucydideum
servire, to be a slave, serve, 7.85.4,
de populis aliorum imperio subditis, concerning peoples subject to others\' rule 1.74.2, 2.63.3, 3.13.6, 5.92.1, 5.100.1. 5.100.18.43.3. 8.48.5, 8.84.5, [i. e. that is μέτρίως].
Transl. translate inservire, to be devoted to, serve, 1.81.6.