The Christian [person] is a completely dutiful servant of all, subject to all.*
For those who are interested in getting a quick overview of this Lutheran lens, I suggest this two minute video. To go deeper, I recommend this study guide. And to read Martin Luther himself, read his treatise on Christian Freedom.
Last week, I started the series with a sermon on Justification by Grace through Faith. I used the example of the grace period at the library. You can hear the sermon here.