διήλθομεν διὰ πυρὸς καὶ ὕδατος → we went through fire and water, we have gone through fire and water
εὔθρους, -ουν και ἐΰθροος, -ον (Α)αυτός που ηχεί δυνατά ή καλά («εὔθροα τύμπανα»).[ΕΤΥΜΟΛ. < ευ + θρους].