Sensual love deceives one as to the nature of heavenly love; it could not do so alone, but since it unconsciously has the element of heavenly love within it, it can do so.
Evil is the radiation of the human consciousness in certain transitional positions. It is not actually the sensual world that is amere appearance; what is so is the evil of it, which, admittedly, is what constitutes the sensual world in our eyes.