Finally, then, brothers, we ask and urge you in the Lord Jesus, that as you received from us how you ought to walk and to please God, just as you are doing, that you do so more and more. For you know what instructions we gave you through the Lord Jesus. (1 Thessalonians 4:1-2 ESV)
The church is called to be pure but how is that possible when we are still in our flesh? Scripture teaches that purity is the work of God and that even the striving toward righteousness is the work of Christ so that all who are in Him are driven to such lives. Make no mistake, those who love sin should check their faith.