Lyric discussion by DexX 

I have read an interview with PG in which he states that Here Comes the Flood is the story of what happens when the entirety of the world's population becomes telepathic, and we can no longer lie to each other or keep secrets.

Here is a snippet of that interview:

When I wrote this song [Here Comes The Flood] I had an obsession with short-wave radio and I was always amazed at the way in which the radio signals would become stronger as daylight faded. I felt as if psychic energy levels would also increase in the night. I had had an apocalyptic dream in which the psychic barriers which normally prevent us from seeing into each others' thoughts had been completely eroded producing a mental flood. Those that had been used to having their innermost thoughts exposed would handle this torrent and those inclined to concealment would drown in it. ('Peter Gabriel' by Armando Gallo, Omnibus Press, 1986.)

So many of the lyrics made sense after reading that!

Interesting. I somehow have the feeling that this lyric is also connected in some way to the book The Crysallids by John Wyndham. If you red the book you´ll see what I mean.

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