DALETH
Text: The 4th Hebrew letter, Daleth (D), means a door or gateway. An early form of this letter was a triangle, the shape of a tent-door, which form is preserved in Greek in the shape of the letter Delta. As we study the accounts in various Sacred Writings of buildings said to have been constructed under Divine direction, according to the various Bibles of the world, we find that each of them had but a single door; this fact is regarded by Kabbalists as a matter of profound significance, and Occultists of many schools say that it refers definitely to a sole method of initiation into the Greater Mysteries. Daleth is mystically connected with the soul of the universe. On a purely physical plane it denotes the womb or matrix throughout nature; it also is associated with ideas of strength and grandeur.
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Source: 72