"now my heart is full"

Does the phrase "now my heart is full" come from some specific source, and what is the context of this exclamation?

I know it's a title of a Morrissey song - a fine song indeed. Since Morrissey often uses quotes from poetry and literature in his lyrics, I thought "now my heart is full" might come from somewhere too, Dickens for example.

Any suggestions?

Thanks,

Mikko,
Helsinki