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in the soul of man there lies one
insular Tahiti, full of peace and joy, but encompassed by all the horrors of the
half known life. God keep thee! Push not off from that isle, thou canst never
return! - Ch 58 Brit
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In answer to John G's query, I propose reading this passage as an implicit invocation of the expulsion from Eden. The underlying assumption is that the divine is found within a person's own soul, while the world without is a source of evil. As with Melville's insular Tahiti, once you leave Eden, you can't go back--not merely because of a formal injunction, but because innocence once lost can never be regained.
Unlike innocence lost, a Paradise Lost doesn't necessarily preclude a Paradise Regained. The evidence of redemption John Gretchko looks for in The Grand Armada is somewhere in M-D, and can be sought and found consistently in Melville's other works, typically figured as the end stage of a psychological sequence progressing successively through stages of innocence, strife, death (defeat), and rebirth (redemption).
But this line of thought seems too serious for a proper enjoyment of Melville's mock-seriousness in the closing passage of Ch 58 Brit. Doesn't it seem that the author is pointedly poking fun at a specific target with the phrase "the horrors of the half-known life"?
Perhaps one of the pleasantest ways anyone has ever said to me "you
don't get this at all."
:-)