“Leader of the Chorus: Weak mortals, chained to the earth, creatures of clay as frail as the foliage of the woods, you unfortunate race, whose life is but darkness, as unreal as a shadow, the illusion of a dream.”

heavily rewritten tr. Frere 1839, p. 38 http://books.google.com/books?id=Bk8JAAAAQAAJ&q=%22Sickly%2C+calamitous+creatures+of+clay%22
Birds (414 BC)

Pythian 8, line 95-8; pages 162-3. (446 BC)
Context: Creatures of a day! What is a man?
What is he not? A dream of a shadow
Is our mortal being. But when there comes to men
A gleam of splendour given of Heaven,
Then rests on them a light of glory
And blesséd are their days.

This Heavy Load (1931)

Source: The City of Dreaming Books

¿Qué es la vida? Un frenesí.
¿Qué es la vida? Una ilusión,
una sombra, una ficción,
y el mayor bien es pequeño;
que toda la vida es sueño,
y los sueños, sueños son.
Variant:
What is this life? A frenzy, an illusion,
A shadow, a delirium, a fiction.
The greatest good's but little, and this life
Is but a dream, and dreams are only dreams.
(trans. Roy Campbell)
Segismundo, Act II, l. 1195.
La vida es sueño (Life is a Dream)

Tears and Saints (1937)

page 154
Source: Suttree (1979)
Context: Pale manchild were there last agonies? Were you in terror, did you know? Could you feel the claw that claimed you? And who is this fool kneeling over your bones, choked with bitterness? And what could a child know of the darkness of God's plan? Or how flesh is so frail it is hardly more than a dream.

As of a Trumpet, 1968, p. 69
As of a Trumpet