Lyric discussion by johny4304 

to restless hearts: "It's a sin, it's a sin, where birds of a feather, are welcome to, land on you". I think hes trying to interpret that his child shares his personal traits/genetics. Its a sin because he might not want his child to share and deal with the same hardships and struggles that he went through that might have been self-distructive from his own personality and so on.

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