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
same
way![1]

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
souls.—[2]
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
that.[3]
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
Berlin.[4]
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
that].[5]
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
!!!![6]
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
from
there.[7]
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