The long dull monotonous years of middle-aged prosperity or middle-aged adversity are excellent campaigning weather for the Devil.
Source: The Screwtape Letters, 1941.
-- C S Lewis, (Nov 29 1898-1963), English author, scholar; He wrote Christian apologetic, The Screwtape Letters, 1942 and children's fantasy, The Chronicles of Narnia, 1954-62.