To me at present the vital achievement of the book is that it inflicts an irrecoverable death-wound upon Intellectualism.
"The Letters of William James, Vol. II"
William James
In all this matter, needless to say, Mr. Lang is not with us; but the affinities of Catholicism with universal religion, which he marks to our prejudice, are really in some sort proof of our contention that the Church is the divinely conceived fulfilment of all man's natural religious instincts, providing harmless and healthy outlets for humours otherwise dangerous and morbid; never forgetful of man's double nature and its claims, neither wearying him with an impossible Intellectualism-a religion of pure philosophy-not suffering him to be the prey of mere imagination and sentiment, but tempering the divine and human, the thought and the word, so as to bring all his faculties under the yoke of Christ.
"The Faith of the Millions (2nd series)"
George Tyrrell
Considering the sorry state of music and Intellectualism in Wagner's time and setting, he surely would have been surprised if his operas and his ideas achieved any wide currency.
"Correspondence of Wagner and Liszt, Volume 1"
Francis Hueffer (translator)