Jean Paul Satre in a letter to Simone Beauvoir
I am mastering my love for you and turning it inwards as a constituent element of myself. This happens much more often than I admit to you, but seldom when I’m writing to you. Try to understand me: I love you while paying attention to external things. At Toulouse I simply loved you. Tonight I love you on a spring evening. I love you with the window open. You are mine, and things are mine, and my love alters the things around me and the things around me alter my love.
Source: http://www.brainpickings.org/index.php/2013/06/21/sartre-love-letter-simone-de-beauvoir/