The Spirits' Book
Book Three - Moral Laws
Chapter VIII - VII. Law of Progress
The March of Progress
784. The perversity of humankind is immense. It seems that human beings are regressing rather than advancing, at least in terms of morality.
“You are wrong. Look at the human race as a whole, and you will see that it is advancing. It has arrived at a clearer perception of what is evil, and witnesses the reform of some kind of abuse every day. An excess of wickedness is required to show the need for good and the need for reforms.”