Doctrina, domus, & ars, & ager, etiam fidelis dici potest, Ci. Familiaritates Græcorum parum fideles. Cic. Gratia fidelissima mihi coniunctus homo. Cic. Lachrymæ fideles. Ouid. Medicus fidelis. Hor. Mente fideli casta sis. Tibul. Monitus fidelis. Ouid. Oculi fideles. Horat. Eies sure of sight.Fidelis opera.Plaut.Earnest diligence.Pax fidelis.Ouid. Ceruus egregiè fidelis. Cice. Silentium fidele. Horatius. Faithful silence not reuealing things.Socius fidelissimus.Cic.Fidelem se hero suo facere.Plaut.To declare himselfe faithful to his maister.
Lewis and Short: Latin dictionary
doctrīna, ae, f. [doctor], teaching, instruction (class.; cf.: litterae, artes, disciplina, praecepta, scientia, humanitas). I. Prop.: non aliqua mihi doctrina tradita, sed in rerum usu causisque tractata, Cic. de Or. 1, 48, 208; 1, 3, 11; id. Off. 44, 155: puerilis, id. de Or. 3, 31, 125; id. Mur. 30, 63; id. Sest. 56; Quint. 2, 8, 3; 6, 3, 12; 12, 2, 1 (in these passages of Quint. opp. natura; cf. also Hor. Ep. 1, 18, 100); id. 2, 12, 8; Hor. C. 4, 4, 33 et saep.—II.Transf.A. Object., the knowledge imparted by teaching, i. e. science, erudition, learning: est unum perfugium doctrina ac litterae, quibus semper usi sumus, Cic. Fam. 6, 12 fin.; so with litterae, id. Rep. 2, 10; Quint. 11, 1, 89; cf. also: nonnulli litteris ac studiis doctrinae dediti, Cic. Balb. 1, 3; and with the latter cf. id. Rep. 1, 9 fin.; id. Or. 10, 34; id. Cael. 10, 24: malis studiis malisque doctrinis, id. Leg. 2, 15 fin.; cf. id. Rep. 1, 17 fin.: Piso Graecis doctrinis eruditus, id. Brut. 67, 236; cf. id. Arch. 7; id. N. D. 3, 9, 23; id. Q. Fr. 1, 1, 7 fin.; id. Rep. 1, 36; id. de Or. 3, 34, 139: ad domesticum morem adventiciam doctrinam adhibere, id. Rep. 3, 3: me omnis ars et doctrina liberalis et maxime philosophia delectavit, id. Fam. 4, 4, 4; cf. id. de Or. 3, 32, 127; id. Ac. 2, 1: dicendi, i. e.
rhetoric
, id. Part. 1, 3: auctor doctrinae ejus (sc. Numae), Liv. 1, 18: doctrina deos spernens, id. 10, 40 et saep.—B. Subject., the habit produced by instruction, principle: mala studia malaeque doctrinae, Cic. Leg. 2, 15 fin.: neque id fecit naturā solum, sed etiam doctrinā, Nep. Att. 17, 3.