There are three plays that are alluded to in Brave New World: The Tempest, Romeo and Juliet, and Othello. These plays are the medium through which John the Savage has learned emotion and recognizes emotion and expresses emotion since his mother is handicapped in this area by her biogenetic engineering and the Indian who lives with her is rather unconcerned with him.
When John arrives in the New World, his first thoughts are comparative with those of Miranda from The Tempest who also has no knowledge of the world. When she first sees other people, the men brought to the island by the magic of her father, Miranda exclaims,
How many goodly creatures are there here!
How beauteous mankind is! O brave new world,
That has such people in't (5.1.207-210)
Since these exclamations are identical to John's feelings, he echoes them. Likewise, when he initially perceives Linda, John finds her so beautiful and physically perfect that, like Romeo, he is starstruck:
...and his voice suddenly...
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