Luther Condemned the Word "Trinity"?

Here's one I found over on the Catholic Answers Forums:

"does anybody have documentaiton [sic] on Luther's criticism of the word 'Trinity'? I read about this in Newman, but don't have a source (I don't recall Newman giving one)"

Here is the Cardinal Newman quote in question:

Lutheranism has by this time become in most places almost simple heresy or infidelity; it has terminated, if it has even yet reached its limit, in a denial both of the Canon and the Creed, nay, of many principles of morals. Accordingly the question arises, whether these conclusions are in fairness to be connected with its original teaching or are a corruption. And it is no little aid towards its resolution to find that Luther himself at one time rejected the Apocalypse, called the Epistle of St. James "straminea," condemned the word "Trinity," fell into a kind of Eutychianism in his view of the Holy Eucharist, and in a particular case sanctioned bigamy. Calvinism, again, in various distinct countries, has become Socinianism, and Calvin himself seems to have denied our Lord's Eternal Sonship and ridiculed the Nicene Creed. {199}[source]

I've been searching around looking for exactly what Newman may have been referring to. Given the examples he uses, it's obvious, his Luther scholarship was a bit weak. That is, he repeats the popular Roman Catholic polemic against Luther.

Each instance I've read from Luther using the word "Trinity" is positive. If Luther did strongly condemn the word, it must have been an isolated instance, or a few isolated instances. That is, if one simply searches Luther's Works for the word "Trinity," you would never arrive at Newman's "Luther condemned the word 'Trinity' ".... at least as something consistently held throughout Luther's career. Keep in mind, condemning a word is not the same thing as condemning a doctrine. Even Roman Catholic historian Hartmann Grisar stated,

Certain controversialists have undoubtedly been in the wrong in making out Luther to have been skeptical about, or even opposed at heart to, many of the ancient dogmas which he never attacked, for instance, the Trinity, or the Divinity of Christ. A few vague and incautious statements occasionally let slip by him are more than counterbalanced by a wealth of others which tell in favour of his faith, and he himself would have been the last to admit the unfortunate inferences drawn more or less rightly from certain propositions emitted by him. [source]

Even the folks on the Catholic Answers board figured this one out. One person quoted a sermon from Luther that states:

Today we celebrate the festival of the Holy Trinity, to which we must briefly allude, so that we may not celebrate it in vain. It is indeed true that the name “Trinity” is nowhere to be found in the Holy Scriptures, but has been conceived and invented by man. For this reason it sounds somewhat cold and we had better speak of “God” than of the “Trinity.”
This word signifies that there are three persons in God. It is a heavenly mystery which the world cannot understand. I have often told you that this, as well as every other article of faith, must not be based upon reason or comparison, but must be understood and established by means of passages from the Scriptures, for God has the only perfect knowledge and knows how to speak concerning himself.

The source for this quote can be found here in a limited preview with some pages missing. The full text can be found in the Complete Sermons of Martin Luther Volume 2 (Grand Rapids: Baker Books, 2000), vol. 2.1 p. 406-407). In this early sermon from 1522, Luther goes on to vigorously argue for the Trinity from the Bible.

A very helpful explanation as to Luther's approach to the word "Trinity" and the limitations of human language and reason can be found here:

In fact, in the very sermon quoted on the Catholic answers forum, Luther immediately goes on to say:

The great universities have invented manifold distinctions, dreams and fictions by means of which they would explain the Holy Trinity, and have made fools of themselves. We shall therefore quote only passages from the Scriptures in order to determine and establish the divinity of Christ. In the first place, we quote from the New Testament, where we find many proof texts; for instance, John I, I-3 : "In the beginning was the Word, and the Word was God. The same was in the beginning with God. All things were made through him; and without him was not anything made that hath been made." Now if he is not made, but is himself the Maker, he must indeed be God. John also says afterwards: "And the Word became flesh." [Sermons of Martin Luther 2.1 p. 407].

He concludes a few sections later, "Therefore we cling to the Scriptures, those passages which testify of the Trinity of God, and we say: I know very well that in God there are the Father, the Son and the Holy Spirit; but how they can be one I do not know, neither should I know it."

Elsewhere Luther comments on the inadequacy of the term "Trinity": "The words trinitas, unitas are really mathematical terms. And yet we can't talk about God without using such words. But at the same time, it is also true that when we use human language to speak about God, it seems to have a ring to it, a whole new connotation" [Complete Sermons of Martin Luther Volume 6, pp. 206-207]. "True [Trinity] is not choice German, nor has it a pleasing sound, when we designate God by the word 'Dreifaltigkeit' (nor is the Latin, Trinitas, more elegant): but since we have no better term, we must employee these" [Complete Sermons of Martin Luther Volume 4.2, pp. 7-8]. I'm sure a plentiful supply of similar sentiment from Luther could be brought forth as testimony to the fact he didn't deny the Trinity, and also used the word positively.

Paul Althaus provides a good overview of Luther's understanding of the Trinty:

Source: Paul Althaus, The Theology of Martin Luther [Philadelphia: Fortress Press, 1966], pp. 199-201

Here's another tidbit to go along with this:

Though correct for leading the Reformation Movement, Martin Luther had been deceived for years on 95 or more points of Roman Catholic teaching. The trinity was not a subject of concern to him. As it turns out, the trinity was the 96th point that Martin Luther did not include in his thesis nailed to the church door.[source]

First it's asserted The Trinity didn't concern Luther. Then it's asserted the Trinity was left off the 95 Theses. Interestingly, the Trinity does appear in Luther's earlier Disputation Against Scholastic Theology, but in no sense important to the charge being asserted. Perhaps the writer is intending to say, "the Trinity should have been the 96th point." That is, the author of the web page finds the Trinity to be a heretical concoction of the Roman Catholic Church. This is probably the sense in which it's intended.