It was the third and final stanza of "The Good Morrow":

My face in thine eye, thine in mine appears,
And true plain hearts do in the faces rest ;
Where can we find two better hemispheres
Without sharp north, without declining west ?
Whatever dies, was not mix'd equally ;
If our two loves be one, or thou and I
Love so alike that none can slacken, none can die.

While I was happy and quite surprised to hear Donne quoted (the theatre-goers around me must have thought me strange), I was still a little unnerved. I agree that the reference does speak to the timelessness of Donne; however, for historical accuracy, having an Irish woman in Ireland quoting a Renaissance poet in the Dark Ages (from a handwritten book) seemed somewhat anachronistic. Perhaps the writers were not comfortable with old Irish verse so they opted for Donne.

Rachel Tomcsik