[...] Just imagine—I have had three returns of erysipelas during May and early June! It has been quite impossible to think of work under such conditions, and even now I must not propose anything of the kind before the end of my cure in the middle of August. I need not tell you how this distresses me!—However, in the late summer I will make up for it by attacking Siegfried with renewed vigour, so that you shall get some manuscript from me again.—[...]
Source: Letters of Richard Wagner, Vol. 1, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 304