κῆρ
τοῖς πράγμασιν γὰρ οὐχὶ θυμοῦσθαι χρεών· μέλει γὰρ αὐτοῖς οὐδέν· ἀλλ' οὑντυγχάνων τὰ πράγματ' ὀρθῶς ἂν τιθῇ, πράξει καλῶς → It does no good to rage at circumstance; events will take their course with no regard for us. But he who makes the best of those events he lights upon will not fare ill.
English (LSJ)
τό, perh.contr.from κέαρ (sed v. infr.); Hom. always κῆρ, dat. κῆρι, Adv. κηρόθι (q.v.); Trag.always κέαρ (no other case):—
A heart, κῆρ γηθεῖ ἐνὶ στήθεσσι Il.14.139; κ. ἄχνυται ἐν θυμῷ 6.523, cf. 7.428; ἄλλα δέ οἱ κ. ὅρμαινε φρεσὶν ᾗσιν Od.18.344, cf. 7.82; τῶ κε . . αἶψα μεταστρέψειε νόον μετὰ σὸν καὶ ἐμὸν κ. Il.15.52; θαλέων ἐμπλησάμενος κ. 22.504, cf. 19.319; τοῦ δ' οὔ ποτε κυδάλιμον κ. ταρβεῖ, of a boar or lion, 12.45: dat. κῆρι as Adv., with all the heart, heartily, ὅν τε Ζεὺς κῆρι φιλήσῃ 9.117: mostly strengthd., περὶ κ. φιλεῖν περὶ Adv., either exceedingly or throughout) 13.430; περὶ κ . . . τιμᾶν τινα Od.5.36, etc.; ἀπέχθωνται περὶ κ. Il.4.53; περὶ κ . . . ἐχολώθη 13.206; νεμεσσῶμαι π. κῆρι ib.119; for λάσιον κ. v. λάσιος; later κῆρ ἄσᾳ βόρηται dub. in Sapph.Supp.25.18; ἐμὸν κέαρ οὐ γεύεται ὕμνων Pi.I.5(4).20, cf. N. 7.102, B.16.108, etc.; κέαρ ἀπαράμυθον A.Pr.187 (lyr.); ἠλγύνθην, ἠχθέσθην κέαρ, ib.247, 392, etc.; paratrag., τὸ κέαρ ηὐφράνθην Ar. Ach.5. (With nom. κῆρ cf. OPruss. seyr, Arm. sirt, 'heart', I.-E. [kcirc ]ērd- (cf. καρδία) ; κέαρ is perh. a later formation on the analogy of ἔαρ: ἦρ.)