" 'Deliver us from evil' (Matthew 6:13). The devil is the great deceiver, and the aim of all his deception, as with temptation, is that we desire anything- even good, safe, wholesome things- above God. He offers a thousand substitutes and threatens us with a thousand miseries in this world. When we pray for deliverance from him, we mean: Never let us be attracted by the substitutes, and never let us infer from our miseries that God is not our all-satisfying Friend."
-John Piper, When I Don't Desire God