Καί of balanced contrast occurs frequently when the subordinate clause sets forth something corresponding to, or deducible from, the main clause; and when an antithesis is to be emphasized. It is found especially in relative, causal, and final clauses, and has the effect of putting such subordinate clauses on a plane with the main clause. A relative word often adds -περ or is followed by δή. Thus,
τὰ δὲ τῆς πόλεως ἔπρα_ττον, ὧνπερ ἕνεκεν καὶ Σωκράτει προσῆλθον
καὶ ἡμῖν ταὐτὰ δοκεῖ ἅπερ καὶ βασιλεῖ
ἐπειδὴ καὶ ἡ πόλις ἐσώθη . . . ἀξιῶ κἀ_μοὶ σωτηρία_ν γενέσθαι
τι_μωρία_ γὰρ οὐκ εὐτυχεῖ δικαίως ὅτι καὶ ἀδικεῖται
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].