[...] I consider, and you will probably agree, that it is too soon as yet to enter into the question of the publication of the Nibelung scores with you. Still, I would gladly receive your views on the matter as occasion offers. I am already engaged on the rough draft of the last work of the cycle, The Twilight of the Gods. Curiously enough, the annoyance to which I was subjected in Munich about this business has not been able to efface the impression made on me by the discovery that even what I know to be a nonsensical, and what was, admittedly, a very spiritless and dull presentation of this most difficult member of the cycle—The Rhinegold—not only failed to ruin the work, but, on the contrary, actually confirmed its appeal to the public, so that, as I have said, a number of theatres are already thinking of taking it up.—Well, it will all be very different another time. [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 638