"You will be glad to hear Sasha dear that also Rudolf has started to work, at last: he actually begun to write his memoirs...Never before he was in such a state of spirit and how happy I am to see him in his present state. He is so absorbed by his work that I cannot get him away from the desk. A new spirit came over him, living through once more every phase of his youth. He has only done two chapters by now, but you can tell already that it is going to be a very interesting work, and I hope a valuable document."
January 1, 1970
https://en.wikiquote.org/wiki/Milly_Witkop