But he had deliberately given Daisy a sense of security; he let her believe that he was a person from much the same stratum as herself
Gatsby defines Self-Security through Wealth
Gatsby put an immense amount of effort into masterminding a of facade of wealth to win over Daisy. However, the primary reason Gatsby worked so hard to change himself is because he knows he intrinsically does not belong or fit into the same social world that Daisy belongs in.
To make up for what he lacks in social graces, he has constructed a “security blanket” for himself via external, material possessions. This quote subtly suggests that although he was trying to convince Daisy of his competency as a partner, he was also trying to convince himself into believing that he is worthy enough to have her. Gatsby seems to lack security and self confidence and the only way he can establish it is to appear economically capable.
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