Erich Fromm
Erich Fromm was a German social psychologist, psychoanalyst, and humanistic philosopher known for his works on the nature of love and freedom.
"To love somebody is not just a strong feeling—it is a decision, it is a judgment, it is a promise. If love were only a feeling, there would be no basis for the promise to love each other forever. A feeling comes and it may go. How can I judge that it will stay forever, when my act does not involve judgment and decision?"