Which case, and why?

Highness is two relations: highness of place and highness of rank. As for highness of place: "And We raised him up to a high place" [Q 19:57]. The highest of places is the place upon which the millstone of the world of the spheres turns, namely the sphere of the sun, and in it is the station of the spirituality of Idrīs. Beneath it are seven spheres and above it are seven spheres, and it is the fifteenth. That which is above it is the sphere of the Red [planet, Mars], the sphere of Jupiter, the sphere of Kaywān [Saturn], the sphere of the [lunar] mansions, the starless (atlas) sphere, [which is] the sphere of the zodiacal constellations, the sphere of the Footstool, and the sphere of the Throne. That which is below it is the sphere of Venus, the sphere of the Scribe [Mercury], the sphere of the moon, the globe of ether, the globe of air, the globe of water, and the globe of earth. So inasmuch as it is the pole of the spheres, it is lofty in place. As for highness of rank, it belongs to us, I mean the Muhammadans.