Woman's Constancy

NOW thou hast loved me one whole day,
To-morrow when thou leavest, what wilt thou say ?
Wilt thou then antedate some new-made vow ?
Or say that now
We are not just those persons which we were ?
Or that oaths made in reverential fear
Of Love, and his wrath, any may forswear ?
Or, as true deaths true marriages untie,
So lovers' contracts, images of those,
Bind but till sleep, death's image, them unloose ?
Or, your own end to justify,
For having purposed change and falsehood, you
Can have no way but falsehood to be true ?
Vain lunatic, against these 'scapes I could
Dispute, and conquer, if I would ;
Which I abstain to do,
For by to-morrow I may think so too.

- John Donne