This passage is in a letter to answer for advertisement about asking for a wife.
( a book called 'Sarah,plain and tall')

I don't understand " The truth is~ go." what does that mean? and why does she say " This should not be taken as an insult" ? 是什麼意思

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"And the truth is, the sea is as far east as I can go"

Maine, where she is from, is on the eastern coast of the USA. By saying this, she means she cannot physically move further east due to the ocean being there.

It shouldn't be taken as an insult. She is just using it to explain that she cannot go any further east!

I hope this was helpful :)