"Our chang’d and mingled souls are grown
    To such acquaintance now,
That if each would resume their own,
    Alas ! we know not how.
We have each other so engrost,
That each is in the union lost.

Thus our twin-souls in one shall grow,
    And teach the World new love,
Redeem the age and sex, and show
    A flame Fate dares not move :
And courting Death to be our friend,
Our lives together too shall end."

from ‘To Mrs. M. A. at Parting’, Katherine Philips (1631-64)