What has to happen in order for the church to be reformed again?

Luther:

Your can put lots of things on the agenda and arrange lots of things, but when you do not prohibit the ministers from acting improperly and insist that they stick to the pure proclamation of the Gospel then it is all meaningless. They have to learn again to preach the truth in fear and trembling alone and to ignore human opinions. Otherwise we do not get anywhere, because in the Word is the foundation of all of ecclesiastical life. Because it is written: ‘He has brought us forth through the Word of truth’ (James. 1:18).