Speak about the paradox in this stanza

What is the paradox in the last stanza which i put in bold letters.

Casida: The Impossible Hand

I want for nothing more than a hand,a wounded hand, if possible.I want for nothing more than a handeven if I spend many nights without a bed.

It would be a pale whitewashed lily,a dove tethered to my heart,a guard who, on the night I pass away,blocks the way to the moon.

I want for nothing more than that handfor daily unctions and the white sheet of my agony.I want for nothing more than that handto carry a wing at my death.

Apart from that, all comes to an end.

A nameless glow. An everlasting star.

What remains is something else; a sad wind,

with flocks of leaves flying away.