Lutheran sanctification

Lutherans aren’t supposed to have a doctrine of sanctification. Nobody told Luther ( Larger Catechism , on the Apostles Creed, 51-53.):

“I believe that there is upon earth a little holy group and congregation of pure saints, under one head, even Christ, called together by the Holy Ghost in one faith, one mind, and understanding, with manifold gifts, yet agreeing in love, without sects or schisms. I am also a part and member of the same, a sharer and joint owner of all the goods it possesses, brought to it and incorporated into it by the Holy Ghost by having heard and continuing to hear the Word of God, which is the beginning of entering it. For formerly, before we had attained to this, we were altogether of the devil, knowing nothing of God and of Christ. Thus, until the last day, the Holy Ghost abides with the holy congregation or Christendom, by means of which He fetches us to Christ and which He employs to teach and preach to us the Word, whereby He works and promotes sanctification, causing it [this community] daily to grow and become strong in the faith and its fruits which He produces.”