From the love letters between Albert and Mileva Maric:
The rules of a relationship...

A. You will see to it (1) that my clothes and linen are kept in order, (2) that I am served three regular meals a day in my room, (3) that my bedroom and study are always kept in good order and my desk is not touched by anyone other than me.

B. You will renounce all personal relations with me, except when they are required to keep up social appearances. In particular, you will not request (1) that I sit with you at home, (2) that I go out with you or travel with you.

C. You will promise explicitly to observe the following points in contact with me: (1) you will expect no affection from me and you will not reproach me for this, (2) you must answer at once when I speak to you, (3) you must leave my bedroom or study at once without protesting when I ask you to go.

D. You will promise not to denigrate me in the eyes of the children either by word or deed.