Celsus, as quoted by Origen, tells us that the Persians represented by symbols the two-fold motion of the stars, fixed and planetary, and the passage of the Soul through their successive spheres. They erected in their holy caves, in which the mystic rites of the Mithriac Initiations were practised, what he denominates a high _ladder_, on the Seven steps of which were Seven gates or portals, according to the number of the Seven principal heavenly bodies. Through these the aspirants passed, until they reached the summit of the whole; and this passage was styled a transmigration through the spheres.
Jacob saw in his dream a _ladder_ planted or set on the earth, and its top reaching to Heaven, and the Malaki Alohim ascending and descending on it, and above it stood IHUH, declaring Himself to be Ihuh-Alhi Abraham. The word translated _ladder_, is [Hebrew: סלם] _Salam_, from [Hebrew: סלל], _Salal_, raised, elevated, reared up, exalted, piled up into a heap, _Aggeravit_. [Hebrew: סללה] Salalah, means a heap, rampart, or other accumulation of earth or stone, artificially made; and [Hebrew: סלע], _Salaa_ or _Salo_, is a rock or cliff or boulder, and the name of the city of Petra. There is no ancient Hebrew word to designate a pyramid.
The symbolic mountain Meru was ascended by Seven steps or stages; and all the pyramids and artificial tumuli and hillocks thrown up in flat countries were imitations of this fabulous and mystic mountain, for purposes of worship. These were the "High Places" so often mentioned in the Hebrew books, on which the idolaters sacrificed to foreign gods.
The pyramids were sometimes square, and sometimes round. The sacred Babylonian tower [[Hebrew: מגדל], Magdol], dedicated to the great Father Bal, was an artificial hill, of pyramidal shape, and Seven stages, built of brick, and each stage of a different color, representing the Seven planetary spheres by the appropriate color of each planet. Meru itself was said to be a single mountain, terminating in three peaks, and thus a symbol of the Trimurti. The great Pagoda at Tanjore was of six stories, surmounted by a temple as the seventh, and on this three spires or towers. An ancient pagoda at Deogur was surmounted by a tower, sustaining the mystic egg and a trident. Herodotus tells us that the Temple of Bal at Babylon was a tower composed of Seven towers, resting on an eighth that served as basis, and successively diminishing in size from the bottom to the top; and Strabo tells us it was a pyramid.