My heart’s beloved:
I am writing you again, because I am alone and because it troubles me always to have a dialogue with you in my head, without your knowing anything about it or hearing it or being able to answer.
Momentary absence is good, for in constant presence things seem too much alike to be differentiated. Proximity dwarfs even towers, while the petty and the commonplace, at close view, grow too big. Small habits, which may physically irritate and take on emotional form, disappear when the immediate object is removed from the eye. Great passions, which through proximity assume the form of petty routine, grow and again take on their natural dimension on account of the magic of distance. So it is with my love…
Excerpt from a love letter from Karl Marx to Jenny Von Westphalen (June 21, 1865)