[...] While you delay in Mainz my Siegfried is progressing in Munich. [...]
I shall take up The Mastersingers again; you can rely upon that. A happy inspiration of that kind works itself out if one has reason to be in good spirits, and everything in my life makes in that direction now. [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 599