9 4 D O C . 1 0 9 S E P T E M B E R 1 9 1 9
109. From Paul Ehrenfest
[Leyden,] 21 September 1919
Dear Einstein,
Your letter made me blush with pride, even though it draws a bold line through
my calculations. And everyone who is fond of you here surely feels exactly the

Right upon receiving your letter I went to purgatory:
1. Because it suddenly became clear to me that the fluctuating valuta should not
be able to give people the right to reach into other people’s
2. Because I would in any case have been obliged to gain complete confidence
about the practicability of my dreams before I should have dared to rattle you about
it.—The added enthusiastic approval by two men who can assess the practical side
of the problem perhaps made me a bit incautious about
In addition to this
was the fear of simply coming too late!–
But you will forgive me for both sins.

Following your letter, I am in complete agreement with you.—Yet it seems con-
ceivable beyond a doubt to me that a way could be arranged for you to be able to
offer Leyden something without being disloyal to
I have already started
to fantasize about that with my junior friends. But I want to save that for your visit
with us, so as not to worry you again before I have anything firm in hand.

Now to your visit with us!! Most preferable would be for me if you came about
October 15th. For I am greatly concerned about whether in the later, colder season
I can guarantee you a room that is simultaneously quiet and well heated. [We don’t
have any coal for the central heating and only 3 ½ rooms of the whole house are
heated!—But from 15 Oct. to 15 Nov. there’s no danger yet of
It is already
arranged that you won’t incur any costs whatsoever for the trip and the stay. You
might help just a little in bringing it up to round figures, though, by presenting a
talk to a sympathetic audience about something simple (e.g., with little philosoph-
ical nuances). However, that is not necessary, in case you find it tedious
On the occasion of your sojourn (which may not under any condition be shorter
than a fortnight!!) I hope to acquaint you with an old country-seat of the finest type
in Dutch culture. You will take back very precious and warm memories with you
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