pertenuis

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.

Latin > English (Lewis & Short)

per-tĕnŭis: e, adj.,
I very thin, very small or fine.
I Lit.: sabulum pertenue, Plin. 18, 6, 7, § 34.—
II Trop., very slight or slender, very weak: spes salutis, Cic. Fam. 14, 3, 2: discrimen, id. Agr. 2, 32, 87: suspicio, id. Clu. 60, 168: argumentum, id. Verr. 1, 6, 17: ars, id. de Or. 1, 23, 107.

pertĕnŭis,¹⁴ e, très fin [en parl. du sable] : Plin. 18, 34 || [fig.] très petit, très faible, très léger : Cic. Clu. 168 ; de Or. 1, 107.