1 7 8 D O C U M E N T S 1 7 6 , 1 7 7 A P R I L 1 9 2 8 176. From Heinrich Zangger [Zurich,] 24 April 1928 Dear friend Einstein, I hope you continue to be so sensible.[1] I also believe that by eating lots of fresh vegetables and fruit, which are now coming in, you will no longer gain weight. Like me, you will also now have to forgo your Italian delicacies a little. So that you see you are not alone in being good: I lay down in your sleeping car around 7 o’clock and got up at 2 o’clock on the Zurich railway bridge and [went] immedi- ately to the institute! Otherwise you wouldn’t have received a typewritten letter. Here is some information about Planck for you.[2] The new formulation of the concept of causality that all the journalists are talking about is not very clear to me. It is probably the same misunderstanding as in an article about your presentation in Davos,[3] which you explained to me. I hope your work goes well,[4] have a slow, smooth return to the driving devil: responsibility for discoveries. So, good weather, short walks, in cool air. Send questions. Best regards, Zangger 177. To Heinrich Brauns[1] [Berlin,] 26 April 1928 Dear Mr. Minister, I am very sorry to have used the imprecise formulation “Prof. Brauer does not have the intensity of ethical will that one must demand in a representative of Ger- many’s intellectual workers.”[2] Nothing was further from my mind than the inten- tion to say anything disadvantageous with regard to Professor Brauer as a person. I meant to say that from the writings, I had the impression that the author of these writings was not driven by a strong need to actively seek the solution for urgent so- cial problems.[3] I have done what I could to form an independent judgment, and I frankly expressed the result of this effort, which I was obliged to make with the