out of the blue

I'm currently reading a book called The Golden Strangers, by Henry Treece. It is set in Britain during the Bronze Age, at the time of the first coming of the Aryan horsemen. Here is an excerpt from the introduction. It was written by Rosemary Sutcliffe, who was a British writer of historical fiction.

"We tend to think how simple life must have been when it only meant the basic things, being born, mating and dying, hunting when one was hungry, tending the odd plot of barley, fighting the occasional eleven-a-side war with the next village. In actual fact, our modern, daylight world, for all it's complications, its myriad acretions from international politics to nuclear fission to the problems of what to do with aged relatives, is almost simple when compared to the complications of life in any Stone Age society, whether it be the Pygmies of the Kalahari to-day, or the little dark people of our own South Downs 4,000 years ago. Simple, because it is a daylight world, concerned mostly with things physical and mental. Stone Age world is a twilight world, with no clear line, no line at all, between things spiritual and things physical. And Henry Treece understands this, not only in his mind, but in his very bones."

I'm halfway through, and this seems like a very apt description.