Thee, Sion, and the flowery brooks beneath, That wash thy hallowed feet and warbling flow, Nightly I visit.
- John Milton
In the swamp, in secluded recesses, A shy and hidden bird is warbling a song. Solitary, the thrush, The hermit, withdrawn to himself, avoiding the settlements, Sings by himself a song.
- Walt Whitman
A poet is a bird of unearthly excellence, who escapes from his celestial realm arrives in this world warbling. If we do not cherish him, he spreads his wings and flies back into his homeland.