By inference, the above statement is indicative of the fact that "The "joy of an achieved desire overtook him" when Ralph first learned (from page 2) that the island may only be home to children. He finally "leaped into actual life" as the envisaged but never fully realized location, as he thinks."
William Golding, a British novelist who won the Nobel Prize, published Lord of the Flies in 1954. The story follows a gang of British guys as they struggle to survive after becoming stuck on an inhospitable island.
Hence the above line is an expression that is suggestive of a person who has finally come to terms with reality.
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