This is what I vow;
He shall have my heart to keep,
Sweetly will we stir and sleep,
     All the years, as now.
Swift the measured sands may run;
Love like this is never done;
He and I are welded one:
     This is what I vow.

     This is what I pray:
Keep him by me tenderly;
Keep him sweet in pride of me,
     Ever and a day;
Keep me from the old distress;
Let me, for our happiness,
Be the one to love the less:
     This is what I pray.

     This is what I know:
Lovers’ oaths are thin as rain;
Love's a harbinger of pain—
     Would it were not so!
Ever is my heart a-thirst,
Ever is my love accurst;
He is neither last nor first—
     This is what I know.

From Enough Rope (Boni & Liveright, 1926) by Dorothy Parker. This poem is in the public domain.

By the time you swear you’re his,
     Shivering and sighing,
And he vows his passion is
     Infinite, undying—
Lady, make a note of this:
     One of you is lying.

From Enough Rope (Boni & Liveright, 1926) by Dorothy Parker. This poem is in the public domain.