Then he said to them, "Suppose one of you has a friend, and he goes to him at midnight and says, 'Friend, lend me three loaves of bread, because a friend of mine on a journey has come to me, and I have nothing to set before him.'
"Then the one inside answers, 'Don't bother me. The door is already locked, and my children are with me in bed. I can't get up and give you anything.' I tell you, though he will not get up and give him the bread because he is his friend, yet because of the man's boldness he will get up and give him as much as he needs.
Jesus, in Luke 11
"From this the Lord would have us understand that if one who was asleep could be constrained to give, even in spite of himself, and after having been disturbed by the person who asked him, how much more kindly will he give who never sleeps, but who rouses us from sleep that we may ask him!"
Augustine, from Augustine on Prayer