As used in Judeo-Freemasonry, the cornerstone is another symbolical synonym of the Seal of Solomon. Mackey notes how the cornerstone, unlike many other symbols used in Freemasonry, cannot be traced back to the Eastern and pre-Biblical pagan cultures or times:

"...the corner-stone seems to be a peculiarly Jewish symbol. I can find no reference to it in any of the ancient pagan rites, and the EBEN PINAH, the corner-stone, which is so frequently mentioned in Scripture as the emblem of an important personage, and most usually, in the Old Testament, of the expected Messiah, appears, in its use in Masonry, to have had, unlike almost very other symbol of the order, an exclusively temple origin." (Albert Mackey, The Symbolism of Freemasonry) Other images said to be used in the Temple of Solomon, such as the Twin Pillars, can be traced back to pre-Judaic cultures, e.g., Egyptian, Mackey suggests. Thus, we might say without exageration that the cornerstone is a pivotal or foundational symbol -- the cornerstone, so to speak, of Biblical symbology. Arguably, in any case, it enjoys a unique historical position as unambigously Hebrew in its roots.

Like others, Methodist minster Rev. Peake, a Freemason who authored the Symbolism of King Solomon's Temple, agrees with Mackey, even though Mackey rejects the notion, advanced by Peake, that Masonic symbolism is Christian. Mackey contends that Masonic symbolism is pre-Christian and therefore, in a sense, non-Christian. Even so, both agree that whatever else may be said of the cornerstone as a Masonic symbol, it is uniquely Jewish in origin. Peake: "The strong imagery of the 'cornere-stone' is peculiarly Jewish, and refers to Him who is often spoken as a man, and, yet, ever more than a man", i.e., the Messiah of Israel (Peake, pp. 37-38, Symbolism of King Solomon's Temple)

Thus, if they are right, the corner-stone is not only a uniquely Jewish symbol associated with Solomon's Temple, but it signifies the messiah of Judaism, Christianity, and Judeo-Freemasonry. It is one among many Freemasonic signs of the The Grand Architect of Freemasonry. As Mackey tells us elsewhere, virtually all of the pivotal Masonic symbols are simply pointing to the same reality; namely, T.G.A.O.T.U., or the god of the Builders (i.e., Freemasons): "...the whole symbolism of Freemasonry has an exclusive reference to what kabbalists have called the ALGABIL -- the Master Builder -- him whom Freemasons have designated as the Grand Architect of Freemasonry." (Albert Mackey, The Symbolism of Freemasonry)

So the corner-stone, in its Masonic usage, is associated not only with the operative craft of Masonry, which is stone-masonry, but also with the unique identity of Masons as "the Builders". For it's customary in Freemasonry to initiate the building of any edifice with an elaborate ceremony that's centered around laying down the corner-stone, the first building-stone of the Builders in building any building.

As Mackey tells us, the corner-stone in Judeo-Freemasonry is always placed at the North-East corner of an edifice, such that two sides of the stone are sometimes exposed and viewable, one one of which, the Eastern side, represents light, since it's from the East that the sun rises, whereas the Northern side of the corner stone signifies darkness, because, as Mackey informs us, "in Masonry, the north has ever been esteemed as the place of darkness and in symbolic obedience to this principle, no light is allowed to illumine the northern part of the lodge." (A. Mackey, The Symbolism of Freemasonry) In contrast, the east side of the cornerstone signifies light.

It will be clear, then, to anybody familiar with the Masonic meaning of Solomon's Seal, how the the northern side of the corner-stone is equivalent in meaning to what is called in the occult the Water Triangle (downward pointing, i.e., dark), whereas the eastern side of the corner-stone is tantamount in meaning to what is called the Fire Triangle (upward pointing, i.e., light). What's more, since the corner-stone represents the Messiah or Moschiach of Masonry, and also represents, as we" have seen, both light and darkness, good and evil, the distinguishing dogma of occult dualism is thus represented by the corner-stone; namely, the belief that god is both light and darkness, good and evil, in which case we can see how the corner-stone is clearly equivalent in meaning to the seal of Solomon, although this fact is nowhere explicitly mentioned, to my knowledge, in Mackey's books.

Ironically, in denying the uniqueness of Jesus Christ as "the way, the truth, and the life", the Freemasons have rejected the only truly and uniquely Jewish foundation stone, the true Messaih of Israel, the real corner-stone, Saviour, and foundation, according to Christians. For in rejecting the Biblical definition of God as being light or pure goodness, in whom there is no evil, darkness, or deceit, Judeo-Freemasonry has denied the uniquely Jewish meaning of what is, claims Mackey, the uniquely Jewish symbol of the corner-stone. Thus the Builders have kept the uniquely Jewish symbol of the corner-stone but rejected the uniquely Jewish meaning of that symbol; namely: "God is light and Him is no darkness at all." (John I, Holy Bible)

Thus, as it is written, so it is: "Behold, I lay in Zion a stone for a foundation, a tried stone, a precious cornerstone, a sure foundation." -- Isaiah 28:16

21:42. Jesus saith to them: Have you never read in the Scriptures: The stone which the builders rejected, the same is become the head of the corner? By the Lord this has been done; and it is wonderful in our eyes. 21:43. Therefore I say to you that the kingdom of God shall be taken from you and shall be given to a nation yielding the fruits thereof. 21:44. And whosoever shall fall on this stone shall be broken: but on whomsoever it shall fall, it shall grind him to powder. 21:45. And when the chief priests and Pharisees had heard his parables, they knew that he spoke of them. Mathew 21:41-44, DRV

This New Testament prophecy is now a vestige of reality and one more among so many historical proofs of the unique greatness and glory of Jesus Christ -- also, of the uniqueness of the Cross of Jesus Christ as a symbol of the utter uniqueness of the God of Issac, Jacob, and Abraham. Today corporate Freemasonry, i.e., The Builders, reject Jesus Christ, who is the true cornerstone, Messiah, and Saviour. Freemasonry considers the wholesome doctrine of Christ to be too divisive and exclusionary. Yet what does the true religion truly exclude if not evil and the exclusionary esoteric doctrines of the Builders?

"Now to you who believe, this stone is precious. But to those who do not believe, 'The stone the builders rejected has become the capstone,' and 'A stone that causes men to stumble and a rock that makes them fall.' They stumble because they disobey the message -- which is also what they were destied for. But you are a chosen people, a royal priesthood, a holy nation, a people belonging to God, that you may declare the praises of him who called you out of darkness into his wonderful light." 1 Peter 2:7-9