And we are done forever

And we are done forever; by and by
I shall forget you, as I said, but now,
If you entreat me with your loveliest lie
I will protest you with my favorite vow.
I would indeed that love were longer-lived,
And vows were not so brittle as they are,
But so it is, and nature has contrived
To struggle on without a break thus far, -
Whether or not we find what we are seeking
Is idle, biologically speaking.