For Luther grace is unconditional, but coming to church isn’t a matter of being relaxed and easy. Coming to church is a matter of first getting prepared and then of being prepared. Not of course by doing things that undermine receiving the grace of God, but by doing things – specifically, by knowing things – that prepare us for receiving his grace.
Luther’s differences with Erasmus’s view, that it is safe to be ignorant of the spiritual bondage of our wills and how it leaves us, is not just an academic matter. Christianity is not simply a religion of maintaining a cultural tradition, of reciting general facts about Jesus and the resurrection. Or about attending church to listen and to sing ‘in community’. If we are not fitted it is a personal, existential, factor. How otherwise than by coming to know God and ourselves can a person, coming into church, be ‘convicted by all…called to account by all, the secrets of his heart are disclosed, and so, falling on his face, he will worship God and declare that God is really among you’. (1 Cor. 14. 24-5)