Good hymn, I reckon it'd be great to sing. I'd love to hear Norma Waterson have a go at it. Or our own champion treaties.

"Archaic language" indeed. Well, it's grammatical, but I'd question whether that in itself counts as archaic. And there are the "thous", which could be sung just as well as "yous". In the context of folksong noone would call jib at that kind of thing? Why are people in church supposed to be so neophiliac anyway? (Well they aren't - it's the people who pick the hymns who are the problem...)