In short, it does not occur to man that God is Father. If it did, man could not live for a single moment. Accordingly in this infirm flesh we must have faith, for if we were capable of fully believing, heaven would already be here. There is therefore no reason to fear, in so far as the object of fear is concerned, and yet we cannot understand and are compelled on account of the weakness of our flesh to suffer assaults of fear and desperation. Thus the catechism remains lord, and there is nobody who understands it. I am accordingly compelled to pray it every day, even aloud, and whenever I happen to be prevented by the press of duties from observing my hour of prayer, the entire day is bad for me. Prayer helps us very much and gives us a cheerful heart, not on account of any merit in the work, but because we have spoken with God and found everything to be in order. (Luther’s Works, v. 54, p.15)