[...] At the end of this month I am leaving Venice to seek refuge in Switzerland, for I do not wish to begin my third act until I am secure from the prospect of interruption by having to change my residence. I shall probably go to Lucerne, and perhaps to the Willes, on the lake at Zurich.
I think of fixing my domicile in Paris from next autumn. But it is possible that I shall go to New York for the winter to conduct my operas and procure enough money for a few years to come. If I had not still to consider the last act, I would meet you in Paris now. [...]
I cannot see my way to make a close to the [Tristan] overture and am sorry, altogether, that I gave you my permission. When I read about the Faust Overture, I began to hope you had given [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 399