1 0 6 D O C . 1 2 3 O C T O B E R 1 9 1 9 great confidence in a positive development of the Jewish colony and am glad that there should be a little patch of earth on which our kindred brethren are not consid- ered aliens. The university cannot be sustained by the country, and its costs must rather be carried communally by the Jewish diaspora, and even the student body must come to a large part from abroad. In any case, we must make sure that this university is presentable next to its better European sisters. There is truly no lack of fine minds.[3] What you wrote me about Ehrenfest interested me very much.[4] I intend to visit him in Leyden in the next few weeks. So, I shall think of you when I next hear about the Palestine University. Cordial regards, yours, Einstein. One can be internationally minded without being indifferent to one’s kinsmen.[5] 123. From Paul Ehrenfest [Leyden,] 5 October 1919 Dear, dear Einstein! Many thanks for your postcard. You can imagine how much we all, every one of us, are looking forward to your coming.[1] But Lorentz and I are naturally con- cerned that you won’t be damaging your health by the trip.[2] —This only you your- self can decide.—Also, you must help me guard you from exhaustion by giving me permission to insulate you from time to time from all visits. [At a moment’s notice, you can withdraw to a completely isolated country estate of some very[3] nice friends—a 2 ½-hour trainride away.] Do please travel here by the best means of transportation (sleeping car, etc.), since all your travel costs from Berlin and back again to Berlin will be fully reimbursed to you in any case, regardless of whether you deliver a talk here or not.[4] Please plan to stay here as long as possible (preferably 4 weeks long), 1. Because only in that way can you continually take rests and still enable the most interesting people to speak with you. 2. Because Hertzsprung and I want to attempt to bring you and Eddington to- gether here [5] synchronization of the two of you will be very difficult, however— almost impossible—if you do not stay here for 3–4 weeks. Immediately upon receiving your postcard I arranged with Onnes that he write to the Passport Center in The Hague: (1) that it is very important to us that you be