|quote=}}</ref> C.S. Lewis stated that the era when people managed to distinguish the difference between what was proved and what was not, a then they truly believed the first, has finished several centuries ago.<ref>{{cite book |title=The Screwtape Letters |author=C.S. Lewis |year=1942, 2013 |publisher=HarperCollins (2013)|isbn=9780062299086 |url=http://books.google.com/books?id=aSj_-mgwWbYC&dq=The+Screwtape+Letters&hl=sk&sa=X&ei=jjrYUsnOJ4Kl4ATe14H4DA&redir_esc=y}}</ref>