In "Piedra de sol," love is the tippy-top of what humans can hope for. It's the way to defeat death, to unite with others, to battle against hypocrisy, and to get outside of time (and you thought it was all just hearts and flowers). Love is, in this poem, something that takes place between two people and that allows them to get outside of everyday life, with its wars and shops and meetings, and to become one with the universe.
In "Piedra de sol," love conquers all—even death.
Love is shallow, and the identity of the lover is meaningless in "Piedra de sol."