Albert Einstein

If one still gets a little tired after a few days—the pleasure of the interesting dialogues would be sufficient compensation, to say nothing of the stimulation and the positive challenge.

You are quite correct that one is most often in want of just this possibility of being alone for a few hours in situations where everyone around is striving to be nice to one.

Now first and foremost my very hearty thanks for your kind invitation to stay with you which I of course accept with the utmost pleasure.