Love comes from lack

"Only a lacking, vulnerable being is capable of love: the ultimate mystery of love, therefore, is that incompleteness is, in a way, higher than completion. On the one hand, only an imperfect, lacking being loves: we love because we do not know all. On the other hand, even if we were to know everything, love would, inexplicably, still, be higher than completed knowledge." From Zizek: The Puppet and the Dwarf. Via high-minded site I Cite.