Thank you,
Mithalwen!
(and sorry for the typo)
The letter "U" was useful after all, it helped me guess "unto world's end" . I also suspected that the second word was "shall", and after trying out several possibilities for the first word, suddenly "hither" popped up from my unconscious, and then I recognized the quote.
OK, here is the next one:
"---/ ---/ --/ --/ ----/ --/ ---/ ---/, ---/ ---------/ ----/ ---/ ---/ ------/ --------/."