Helpful medicine when you're feeling defeated: find a Lutheran talking about justification. Here's Gerhard Forde on the shocking freeness of justification by faith alone:
[S]tick with it and sail into the storm with all guns blazing. 'We have to do something, don't we?' NO! In fact that is no longer the question. Now the question becomes, 'What are you going to do now that you don't have to do anything?' Theology based on the [Augsburg Confession] is not interested in 'something'; it is after everything.
A pastor friend related an interesting reaction from a teenager to [this notion]. . . . [I]t seemed to tell him he could do anything he wanted to do! Now what is one supposed to say to that? The most immediate reaction, I suppose, would be to jump in on the defensive and thunder, 'No! No! No!--of course not, you can't do whatever you want to do!'
But think for a moment. Perhaps then the whole battle would be lost. One must sail into the storm. Should one not rather say 'Son, you are right. You got the message. The Holy Spirit is starting to get to you.'
But is that not dangerous? . . . Is it not 'cheap grace'? No, it's not cheap, it's free! 'Cheap grace,' you see, is not improved by making it expensive. . . . It's free. Now free grace is dangerous, no doubt about it. . . . We might not survive such free grace. It might ruin us. But Jesus told us that long ago: 'To him who has, more will be given, but from him who has not, even that will be taken away.'
There is indeed a danger.
--G. Forde, Justification by Faith: A Matter of Death and Life (Fortress 1982), 33-34; italics original