Allan Kardec. The book of spirits (№ 397302)

Question: History tells us of many Nations that befell them after the shocks are back to barbarism. What in this case is progress?
Answer: When your house threatens to collapse, do you break it to build it a more durable and more convenient; but until it is built, not restored, in your dwelling there is disorder and confusion. Understand also that you were poor and lived in a hovel, but you get rich and leave her to live in the Palace. And then some poor, just like you, takes your place in that shack and still very satisfied, because before he didn't have it. Now! Know that the spirits embodied now in this viridissima the people, not the same as it was during its heyday; those who lived in it before and were promoted, retired to the abode of the more advanced and progressed further, while other, less advanced have taken their place and they in turn leave.