Fight the good fight (agōnizou ton kalon agōna). Cognate accusative with present middle imperative of agōnizō, Pauline word (1Co 9:25; Col 1:29).
Lay hold on (epilabou). Second (ingressive) aorist middle imperative of epilambanō, “get a grip on.” See same verb with genitive also in 1Ti 6:19.
Thou wast called (eklēthēs). First aorist passive of kaleō as in 1Co 1:9; Col 3:15.
The good confession (tēn kalēn homologian). Cognate accusative with hōmologēsas (first aorist active indicative of homologeō, the public confession in baptism which many witnessed. See it also in 1Ti 6:13 of Jesus.