Dear Marion,

Thank you for your letter. I agree that the
epistolary exchange might reasonably be less frequent;
and I will limit myself to answering your letters.
Therefore it will be for you to determine the
frequency of the correspondence.

As for its content, you shouldn't feel obligated to
respond to any of my ideas. I've been working on some
of them for decades, and it's unreasonable to assume
that you should find yourself in a position to reply
to them before weeks or months have passed, and perhaps
not even then.

Thank you for your patience and forbearance.

Jochen