When Benedict speaks of love as the "primordial cosmic force," he knows of course that science traces the movement of the sun and stars to the Big Bang, gravity and other forces of nature. He is, nonetheless, claiming that the truest, most fundamental insight into the nature of the cosmos and humanity is found in our experience of love, beginning with the paradigm of erotic love and crowning it in religious faith.
Is this claim really uncontroversial? Humans, after all, have offered any number of ultimate characterizations of reality, from a swirl of atoms to a struggle for survival, from a war between matter and spirit to the search for pleasure and release, from the slow march of rationality to a cloud of illusion.
There is plenty of evidence for each of these views. One can easily argue that the case for love, personal, self-giving love, as the bottom-line character of reality is the wildest, most astonishing of claims in the face of that evidence.
At the deepest of levels, is the parent caring for the ill or troubled child or the couple pledging mutual affection and support till death do them part going with the grain of the universe or acting in defiance of it? Is such love a flame that somehow begins and ends in a larger fire? Or is it a brief, bold flare that will ultimately be snuffed out in the darkness?