When we love someone, we often reference some attribute of theirs that first attracted us. It might be their appearance or the sound of their voice. It could be the way they carry themselves or how they relate to others. In any case, our human concept of love is generally associated with some basis, some external reason why love is merited and therefore extended. In human terms, love is stimulated in the lover because of a perceived worthiness in the beloved.
I believe that God's love is different. It requires no basis in the sense of some external reason to love. God's love is extended because of his very nature, not because of any attribute in the beloved which establishes worthiness. That is not to say that God does not or cannot perceive of each of us as worthy, much as we parents see our children as worthy. But in God's case, he is love. He loves because of who he is, not because of who we are. God can no more forsake love than He can forsake Himself. Love without basis is divine love, the real kind.