The grace of God in Jesus Christ, the sinless Bridegroom who laid down his life for the church in order to present her as blameless to the Father in great glory, so secures the children of God who make up this bride that they need not fear, as Luther said, "sinning boldly." Luther wasn't encouraging us to walk in ways that are contrary to the commands of God. Rather, he was reminding us that regardless of whatever perversions we are guilty of, God's grace covers that perversion, and we are encouraged to run to him and not from him. We can come just as we are to Jesus Christ; he does not love some future version of us, but he loves the real us, the wounded us, the messy us, the broken us... In a gospel centred marriage, when two souls are mingled together with the Holy Spirits leading, we find conformation after conformation that grace is true, that grace is real - that we can be really, truly, deeply known and at the same time really, truly, deeply loved.