[...] Now for Natalie. After ripe consideration, I feel it my bounden duty to be absolutely opposed to Natalie's coming to Paris. The experiences of your incompatibility are so utterly deterrent that I should think myself greatly to blame for making a fresh experiment in this direction in the present state of your health. The last attempt has just been made in Dresden, and I have gathered repeatedly from your own letters that you two cannot hit it off for any length of time. On the other hand, in your last change of mind I perceive the same weakness which you showed four years ago when we corresponded on this point between Zurich and Mornex and you suddenly declared for Natalie's remaining again. I experienced the results of it in the unseemly scene which finally hastened Natalie's departure, which should never have occurred, and which must not recur in our house for the future. I am not inimical to Natalie on that account all the same, and shall hold to what I promised her in my last letter. [...]
Source: Letters of Richard Wagner, Vol. 2, selected and ed. Wilhelm Altmann, trans. M. M. Bozman (J. M. Dent & Sons, 1927), No. 437