Amazing Grace

It's been a while since I posted one of these:

Θαυμαζω χαριν τοσαυτην,
σεσωκεν ‘η εμε.
απολωλως, νυν εὑρημαι,
τυφλουμενος, βλεπω.

(Thaumazō charin tosautēn,
Sesōken hē eme.
Apolōlōs, nun heurēmai,
Tuphloumenos, blepō)

The eta in line 2 should have a grave accent (it's a pronoun), but I can't make that work. The last word in line 3 is the passive of "eureka!"

The tune, of course, you know.