and even as ruby dreamed her heart stayed awake , listening for these stanzas of her song , this song above all other songs , setting out in true lines the desire that would suddenly come upon her , for her beloved when he should reveal himself , coming out of the wilderness like a column of smoke , sweetened with incense and blowing only for her and the desire that was within her , sweeping towards her on the south wind that that is warmed by the desert places .