For We have caused none but angelic powers to lord over the fire [of hell]; and We have not caused their number to be aught but a trial for those who are bent on denying the truth - to the end that they who have been granted revelation aforetime might be convinced [of the truth of this divine writ]; and that they who have attained to faith [in it] might grow yet more firm in their faith; and that [both] they who have been granted the earlier revelation and they who believe [in this one] might be freed of all doubt; and that they in whose hearts is disease and the who deny the truth outright might ask, "What does [your] God mean by this parable?" In this way God lets go astray him that wills [to go astray], and guides aright him that wills [to be guided]. And none can comprehend thy Sustainers forces save Him alone: and all this is but a reminder to mortal man.