In the devil's words:
Do not be deceived, Wormwood, our cause is never more in danger than when a human, no longer desiring, but still intending, to do our Enemy’s will [God’s will], looks round upon a universe from which every trace of Him seems to have vanished, and asks why he has been forsaken, and still obeys [C. S. Lewis, The Screwtape Letters, ch. 8].