midnight
Then it changed , and glowed like Persian dawns ; or passive , was shot over by palest lightnings ; -- so variable its tints . `` The night-blowing Cereus ! '' said Yoomy , shuddering , `` that never blows in sun-light ; that blows but once ; and blows but for an hour . -- For the last time I come ; now , in your midnight of despair , and promise you this glory . Take heed ! short time hast thou to pause ; through me , perhaps , thy Yillah may be found . '' `` Away !