I was reading some in Sasse today, and came across this passage. I think it is very sad that we can no longer make such a claim:
Despite its decided rejection of false teachings which prevail in other churches, our church has never denied the presence of the church of Christ in the established churches of England and Scotland, in Holland and Switzerland, in Spain and Italy, in Greece and Russia. It has not tried, therefore, to conduct missions for the Lutheran confessional church in these countries, just as it has avoided the "evanglicalization" of Catholic territories in Germany. Let all those who accuse Lutheranism of intolerant confessionalism reflect on the fact that the Lutheran Church is one of the very few churches in Christendom which has never, under any circumstances, engaged in propaganda for itself or conducted missions among Christians of other persuasions. (Here We Stand, pp. 182, 183)
Ah, how unablaze can you get, I ask you? Yes to missions where Christ has not been named, but a refusal to attempt proselytizing Christians of other confessions to embrace Lutheranism.
"Our church knows that it can do no more than bear witness before Christendom, before all communions and denominations, to the understanding of the divine Word which has been vouchsafed it. What happens to this witness, whether it is heeded or not, does not lie in its power. Thus the two statements stand side by side: the Lutheran Church which is faithful to its confession is the true church of Jesus Christ, and the church of Christ is not limited to the church of the Lutheran Confession. The two statements are inseparably connected to the Lutheran doctrine of the church." (p. 183)
The whole of the book is worth attending to, but perhaps particularly Sasse's last chapter titled *The Lutheran Church and the Una Sancta.*