In these New Testament times there is always a lack of Christians; there never are enough of them.  Therefore we must not stop inviting guests to partake of this Psachal Lamb.  But we must keep on preaching.  We must also go to those to whom Christ has hitherto not been proclaimed.  We must teach the people who have not known Christ, so that they, too, may be brought to the spiritual kingdom of Christ.

 What Luther Says - #3018