Identify and explain the thematic significance:

1. This work will be found to be lacking in prefatory sonnets by dukes, marquises, counts, bishops, ladies, and poets of great renown.
   
   
2. This was the place we reached; the ditch beneath
   held people plunged in excrement that seemed
   as if it had been poured from human privies.
   
   
3. Our revels now are ended. These our actors,
   As I foretold you, were all spirits, and
   Are melted into air, into thin air;
   And, like the baseless fabric of this vision,
   The cloud-capped towers, the gorgeous palaces,
   The solemn temples, the great globe itself,
   Yea, all which it inherit, shall dissolve;
   And, like this insubstantial pageant faded,
   Leave not a rack behind. We are such stuff
   As dreams are made on, and our little life
   Is rounded with a sleep .