τί ἥδιστον, τὸ ἐπιτυγχάνειν → what's pleasant, to get the goal
Persēis: ĭdis, f., v. 2. Persa, B.
Persēis,¹⁵ ĭdis, f. (Περσηΐς),1 c. Persa 2 : Cic. Nat. 3, 48 ; Val. Flacc. 7, 2382 Hécate, fille de Persès : Stat. Th. 4, 481
