3 8 0 D O C U M E N T S 4 1 6 , 4 1 7 M A R C H 1 9 2 9 416. To Eduard Einstein [Berlin, on or after 1 March 1929][1] Dear Tetel, I simply cannot make up my mind to travel. First of all, I am not healthy enough for that, even if I am feeling pretty well, and I’ll be bothered and gawked at every- where at the inns where the bourgeois socialize but I can’t rough it. So I strongly urge you to come here. Albert is also coming with his frumpy wife.[2] I have to vamoose around the 14th.[3] But otherwise I think I’ll stay here. I must incessantly take care that no one gives me God knows what big things that are not compatible with my Gypsy-like way of life—all because of the fiftieth birthday. My theory has now wonderfully matured. So far, I am the only one of my col- leagues to be fascinated by it, but I am totally and feverishly into it. I hope you have received the package. Read the big Shaw book![4] It will also interest Mama. A splendid book. I also have something rather special for you, a kind of soul-mechanics by a meschugge engineer.[5] It’s uncommonly interesting. The house thing is definitely off a summer cottage in the area is to be bought instead. However, all these projects are ill-starred, since in the end nothing comes of them.[6] Dear Tetel! I am really longing for you. When are you coming? With best regards to you both,[7] your Papa Best regards to your assassin, and to Dr. Zürcher too.[8] 417. To Émile Borel[1] [Berlin,] 2 March 1929 Dear Mr. Borel, It is with a highly concentrated mixture of joy and pain that I have taken notice of your report and your invitation.[2] The feeling of sincerity and recognition that is expressed therein has done me a world of good. I hereby express my heartfelt thanks to you and to all those who have worked together on this matter. But for me the painful side of this lies in the fact that my fervent wish to accept your invitation cannot be fulfilled because of the continuing fragility of my health that accompa- nies my heart problems. According to the categorical verdict of my doctor friends, for the rest of my life I will be absolutely forbidden to undertake presentations be- fore large groups or even official trips. Therefore I must limit myself to expressing my sincere thanks to you and to my other friends there for this fresh proof of their good will and friendly disposition.— Best regards, your