All love may begin by being passionate, especially for younger people. But in the process of living together, they have to learn and practice love, so that selfishness--the tendency to possess--will diminsh, and the elemetns of understanding and gratitude will settle in, little by little, until their love becomes nourishing, protecting, and reassuring," (41).
Thich Nhat Hanh, For a Future to Be Possible: Buddhist Ethics for Everyday Life
love, passion, selfishness