7 April 1907

Dear colleague,1

I am choosing different paper2 because I don't wish to feel cramped in speaking to you. Your visit was most delightful and gratifying; I should like to repeat in writing various things that I confided to you by word of mouth, in particular, that you have inspired me with confidence for the future, that I now realize that I am as replaceable as everyone else and that I could hope for no one better than yourself, as I have come to know you, to continue and complete my work. I am sure you will not abandon the work, you have gone into it too deeply and seen for yourself how exciting, how far-reaching, and how beautiful our subject is.

Of course I am thinking of a return visit to Zürich, on which occasion I hope you will demonstrate your famous Dem. praecox case,3 but I doubt if it will be very soon. At the moment I am also troubled