O sweet everlasting Voices, be still; Go to the guards of the heavenly fold And bid them wander obeying your will, Flame under flame, till Time be no more....

I am haunted by numberless islands, many a Danaan shore, Where Time would surely forget us, and Sorrow come near us no more;Soon far from the rose and the lily and fret of the flames would we be, Were we only white birds, my beloved, buoyed out on the foam of the sea!

A tree there is that from its topmost bough Is half all glittering flame and half all green Abounding foliage moistened with the dew; And half is half and yet is all the scene; And half and half consume what they renew....

A symbol is indeed the only possible expression of some invisible essence, a transparent lamp about a spiritual flame; while allegory is one of many possible representations of an embodied thing, or familiar principle, and belongs to fancy and not to imagination: the one is a revelation, the other an amusement.