Once you think properly about it love is the only true definitive quality for humanity. Or perhaps it is that the humanity is the essence of love. Who knows? The paradox of love is that it is instinctive. Disregard the free thought. Disregard all of philosophy ever existed. Disregard the whole cultural development for the past 5000 years or so. Tear down the entire coulisse of the so called humanity and all that will left of us is the genetically coded ability to love and to be loved. The overflow of the movement in the eternal cycle of Nirvana that made our species develop beyond any animal-like creature. That my human friends is the core of love.