19 Preface لَتَركَبُنَّ طَبَقًا عَن طَبَقٍYusuf AliYe shall surely travel from stage to stage.1Man travels and ascends stage by stage. In 67:3 the same word in the form ṭibāqa was used of the heavens, as if they were in layers one above another. Man’s spiritual life may similarly be compared to an ascent from one heaven to another.